- Open Access
Infant feeding and health-related quality of life in healthy Chinese infants: results from a prospective, observational cohort study
© The Author(s). 2016
Received: 19 January 2016
Accepted: 3 August 2016
Published: 8 August 2016
Infant feeding regimens, including breastfeeding, formula-feeding, or a combination of the two, may influence infant health-related quality of life (HRQOL). However, few studies have examined this association.
This prospective cohort study assessed HRQOL in relation to three parent-selected feeding regimens: exclusively breastfed (n = 136), exclusively study formula-fed (n = 140), and mixed-fed with study formula and breast milk (n = 151). Healthy Chinese infants were enrolled at their first normally scheduled well infant clinic visit at age 42 days (study day 1). Parents independently chose their infants’ feeding regimens prior to recruitment into the study, with infants in the formula and mixed-fed groups already consuming an infant formula enriched with α-lactalbumin and increased sn-2 palmitate and oligofructose. The Infant and Toddler Quality of Life Questionnaire, which includes six infant-focused and three parent-focused concepts, was used to assess HRQOL at day 1 and at a follow-up visit 48 days later. Scores for each concept ranged from 0 to 100. Parent quality of life (assessed using the Mental Component Summary score of the SF-12v2 Health Survey) was included in the ANCOVA model to adjust for its potential effect on parent’s perception of infant HRQOL.
HRQOL concept scores were high in all three study groups at both visits (mean scores 71–95). Day 1 HRQOL scores were not significantly different between groups. At day 48, 5 of 9 HRQOL scores were not significantly different between groups. However, scores for Temperament and Moods, General Health Perceptions and Parent Impact–Time were slightly but statistically significantly lower in the formula-fed group (mean scores 75–86; all p ≤ 0.01) compared to the breastfed (78–90) and mixed-fed (77–91) groups. Day 48 Parent Impact–Emotional scores were also significantly lower by a small margin (4 points; p = 0.003) in the formula-fed group compared with the breastfed group.
HRQOL was high in this population of healthy infants, with only a few small differences in HRQOL concept scores observed between breastfed, formula-fed and mixed-fed infants. These results indicate favorable physical, mental, and social well-being in these infants and parents. Assessment of infant HRQOL is therefore feasible and provides valuable insight into parental perceptions of their child’s health and well-being.
Breast milk is considered the best source of nutrition for infants , but for a variety of reasons many parents choose to supplement breastfeeding with some formula-feeding or to provide feedings exclusively with infant formula. Optimizing health outcomes of formula-fed infants is therefore a public health priority . Infant health-related quality of life (HRQOL), a broad concept that encompasses aspects of physical, psychological, and social function , is an important outcome that may be directly affected by an infant’s feeding regimen in at least two ways. First, the infant’s feeding regimen may influence feeding tolerance and gastrointestinal (GI) symptoms. For example, compared with breastfed infants, infants who are fed standard formula have harder stools [4, 5], which can lead to constipation and discomfort. Second, feeding regimen may influence immune function and susceptibility to illnesses or infections . For example, breast milk has been shown to support immunity through transmission of maternal immune agents and by promoting a unique balance of microflora in the gut  that may offer immune benefits . However, despite a need to better understand infant HRQOL in relation to feeding regimen, there is little research on this association to date .
Infant formula containing structured lipid (i.e., fat with an increased proportion of palmitic acid in the sn-2 position) and oligofructose (a non-digestible soluble dietary fiber) has been developed to promote the formation of softer stools that are more like those of breastfed infants [10, 11]. In addition, oligofructose is a prebiotic  that has been shown to influence the growth of bifidobacteria to levels that are within the range of levels found in breastfed infants . The aim of this study was to assess HRQOL in infants consuming an infant formula with increased sn-2 palmitate and oligofructose (study formula) either alone or as a supplement to breastfeeding, and to compare this to HRQOL in infants consuming breast milk exclusively. Although there are methodologic difficulties of measuring HRQOL in infants , several valid and reliable instruments exist to examine infant HRQOL through proxy report by the parent or caregiver [9, 15–17]. We used the Infant and Toddler Quality of Life Questionnaire (ITQOL)  to assess HRQOL as a function of feeding regimen in a large prospective study of Chinese infants. We hypothesized that infants fed the study formula either alone or as a supplement to breast milk would have the same HRQOL as infants fed breast milk alone.
This was a 48-day prospective, observational cohort study involving a representative sample of healthy term infants enrolled from 24 hospitals across 14 major cities in Eastern, Central and Western China between September 2011 and June 2013. The study was approved by the Institutional Ethics Committee of each hospital. Infants 35–49 days old (mean 42 days) were enrolled at the time of their normally scheduled, 6-week, well infant clinic visit and grouped based on their parent-selected, pre-study feeding regimen. Infants were included if they were healthy, singleton, born at 37–42 weeks of gestation, and measured between the 5th and 95th percentiles (inclusive) in weight-for-age according to the World Health Organization (WHO) growth standards . Infants with major congenital anomalies, suspected or documented systemic or congenital infections, or other severe acute or chronic medical conditions or laboratory abnormalities that would have increased the risk associated with study participation or interfered with interpretation of results were excluded. Likewise, infants with conditions requiring infant feedings other than those specified in the protocol, those receiving complementary foods or liquids (e.g., more than 5 mL of fruit/vegetable juice per day), or those receiving any medication(s) or vitamin/mineral/herbal supplement(s) known or suspected to affect study outcomes (e.g., fat digestion, absorption and/or metabolism; stool characteristics) were excluded. Finally, infants were included in the study only if parent(s) or legally acceptable representative(s) (henceforth “parents”) provided informed consent indicating that they were willing and able to comply with scheduled visits and other study procedures.
The study included data collection at three clinic visits: clinic visit 1 (study day 1; infant age ~42 days), clinic visit 2 (study day 18 ± 3; infant age ~60 days), and clinic visit 3 (study day 48 ± 3; infant age ~90 days). The timing of data collection was chosen to coincide with the typical schedule of well infant clinic visits in China. Feeding regimen was assessed at clinic visit 1, and HRQOL data were collected at clinic visits 1 and 3.
Exposure: feeding regimen
Infants were grouped into three different categories based on the infants’ feeding regimens, previously chosen by parents, and fed for a period of at least 3 days prior to enrollment: (1) exclusively study formula-fed, (2) exclusively breastfed, or (3) mixed-fed with study formula and breast milk. To be included in a particular feeding group, parent(s) must have previously made the decision to voluntarily continue with their infant’s current feeding regimen. Infants fed any types or brands of formula other than the study formula (either exclusively or in a mixed feeding regimen) at the time of study enrollment were excluded. Study formula was commercially available and thus fully compliant with Chinese infant formula standards, and was not provided to any of the study participants; rather, parents continued to purchase the formula as they had prior to study enrollment. Investigators were not involved in any feeding decisions.
Parents were free to switch their infant to other feeding regimens at any time during the study. Continued follow-up of these infants depended on the new feeding regimen and the timing of the switch relative to study days 15–17 (when parents completed the second of several three-day diaries on infant stool characteristics, another study outcome reported separately ). If the infant was switched to another of the three study feeding regimens (e.g., from exclusively breastfed to mixed-fed with study formula and breast milk) before the completion of the second three-day infant stool diary, the infant continued to participate in the study. If the infant was switched from their current feeding regimen to a feeding regimen with a non-study formula before the completion of the second three-day infant stool diary, the infant was withdrawn from the study. If the infant was switched to any feeding regimen after the second three-day infant stool diary, the infant remained in the study. Infants remained categorized according to their initial feeding regimen, even if switching occurred later. Only 38 infants switched to a different feeding regimen during the study.
Outcome: health-related quality of life
Infant HRQOL was assessed using a standardized validated questionnaire, the Infant and Toddler Quality of Life Questionnaire (ITQOL), at clinic visit 1 and clinic visit 3. The ITQOL was translated for this study into Simplified Chinese using a standardized linguistic validation process, and the translated tool has been shown to perform well, have good reliability, and discriminate across illness-related categories in this population of very young infants .
The ITQOL questionnaire consists of 97 questions. Of these, 29 are not relevant for infants who are less than 1 year old; thus this study used the remaining 68 questions. The ITQOL asks parents about six infant-focused concepts including overall health, physical abilities, growth and development, bodily pain/discomfort, temperament and moods, and general health perceptions. In addition, the ITQOL measures three parent-focused concepts including the impact of infant health and well-being on parents’ emotions, such as worry (“Parent Impact—Emotional”), on parents’ time for personal needs (“Parent Impact—Time”), and on parents’ perceptions of how the family is getting along with one another (“Family Cohesion”). The recall period for the ITQOL is 4 weeks. For each of the six infant-focused and three parent-focused concepts, the mean response values for items used to assess the concept constituted the raw score. In cases of missing values, the mean was calculated on non-missing data if fewer than half of the concept items were missing; if half or more were missing then the concept value was set to missing. Raw scores were standardized to the range of possible concept scores using standardized scoring instructions . The standardized values ranged from 0 to 100, with higher scores indicating better quality of life for the particular concept being measured.
Covariate: parent health-related quality of life
Parent HRQOL was assessed using the Short Form 12 Health Survey, version 2 (SF-12v2) . The Chinese version of this questionnaire has been shown to be valid, reliable and sensitive for this population . The same caregiver / parent completed both the SF-12v2 and the ITQOL. The SF-12v2 assesses 8 health domains from which two summary measures are calculated: the Physical Component Summary (PCS) and the Mental Component Summary (MCS). If more than half of the questions within a health domain was missing, then that health domain was considered missing and the PCS and MCS were not calculated. Health domain scores were standardized to a mean of 50 and a standard deviation of ten with higher scores indicating better health . The MCS score of the SF-12v2 was used to adjust for potential effects of the parent’s own mental functioning on their perception of their infant’s quality of life.
Analysis of covariance (ANCOVA) was used to compare the scores for the six infant-focused concepts and three parent-focused concepts of HRQOL across the three feeding regimen groups at day 1 and day 48. Since infants were enrolled based on their pre-existing feeding regimens, scores at day 1 cannot be considered baseline values and thus were not included in the day 48 ANCOVA model as a covariate. ITQOL concept scores were found to be non-normally distributed, therefore a non-parametric alternative to ANCOVA based on ranks  was performed for the main analysis; parametric tests were performed for comparison and found to produce similar results (data not shown). The MCS score from the SF-12v2 was included in the model as a covariate. An overall comparison of the three feeding groups was done as well as the three possible pairwise comparisons. Analyses were conducted using SAS (version 9.1.3, SAS Institute Inc., Cary, NC, USA).
Infant, parent, and household characteristics at time of study enrollment a
Study formula-fed only (n = 140)
Breastfed only (n = 136)
Mixed-fed (breastfed and study formula-fed) (n = 151)
42.2 ± 3.6
42.3 ± 3.7
42.5 ± 3.4
Gestational age, weeks
38.6 ± 1.0
39.0 ± 1.0
38.9 ± 1.0
4.9 ± 0.5
5.0 ± 0.5
5.0 ± 0.5
Sex, % male
Birth order, % first birth
Type of delivery, % Cesarean
Attend day care
14.6 ± 2.8
15.8 ± 3.0
15.3 ± 2.8
Service or retail
14.7 ± 3.0
15.6 ± 2.8
15.4 ± 3.0
Service or retail
Parent SF-12v2 Physical Component Summary (PCS) and Mental Component Summary (MCS) scores across infant feeding regimen groups at enrollment (study day 1) and study day 48
Study formula-fed only
Mixed-fed (breastfed and study formula-fed)
PCS, mean ± SD
49.2 ± 8.1
50.6 ± 6.6
49.9 ± 7.7
51.6 ± 6.6
52.6 ± 5.4
51.7 ± 7.2
MCS, mean ± SD
50.3 ± 8.9
51.8 ± 8.0
50.7 ± 8.2
53.1 ± 7.1
52.1 ± 8.4
52.2 ± 7.9
ITQOL scores across infant feeding regimen groups at enrollment (study day 1) and study day 48a
Study formula-fed only (n = 140)
Breastfed only (n = 136)
Mixed-fed (breastfed and study formula-fed) (n = 151)
77.9 ± 19.2
80.0 ± 15.9
78.4 ± 17.4
79.4 ± 16.4
78.6 ± 14.5
79.3 ± 17.6
94.3 ± 6.3
86.4 ± 15.6
80.6 ± 28.3
94.1 ± 6.3
84.7 ± 18.6
75.9 ± 29.8
Growth and Development
81.4 ± 15.2
84.3 ± 14.1
82.3 ± 14.6
84.9 ± 13.9
84.5 ± 14.6
83.6 ± 15.3
92.9 ± 12.6
93.6 ± 11.7
92.9 ± 12.4
94.1 ± 11.4
94.9 ± 8.8
94.3 ± 9.8
Temperament and Moods
71.2 ± 8.0
73.8 ± 9.5
72.2 ± 9.1
74.5 ± 9.2 1
77.7 ± 8.4 2
77.0 ± 8.3 2
General Health Perceptions
81.3 ± 11.4
84.2 ± 10.2
83.3 ± 10.5
81.1 ± 11.7 1
84.7 ± 11.8 2
85.5 ± 9.3 2
Parent Impact – Emotional
87.6 ± 17.1
89.4 ± 17.0
87.0 ± 15.4
88.0 ± 15.7 1
91.9 ± 12.8 2
90.0 ± 10.8 1,2
Parent Impact – Time
83.3 ± 21.4
88.2 ± 15.4
88.1 ± 13.3
85.9 ± 18.7 1
90.0 ± 14.2 2
90.9 ± 10.8 2
79.9 ± 19.5
79.5 ± 18.6
79.3 ± 18.0
81.0 ± 16.2
79.0 ± 18.4
80.6 ± 19.1
In this study, we found high HRQOL scores at both study visits, regardless of feeding regimen. A few small differences were observed at day 48 between study formula-fed and exclusively breastfed infants on two infant-focused HRQOL concepts (Temperament and Moods, General Health Perceptions) and two parent-focused HRQOL concepts (Parent Impact—Time and Parent Impact—Emotional). Similar small differences were observed at day 48 between the study formula-fed and mixed-fed groups for Temperament and Moods, General Health Perceptions, and Parent Impact—Time. All of these differences, while statistically significant, were quite modest – ranging from 3 to 5 points on a 100-point scale. Prior studies consistently suggest that changes in HRQOL of a half a standard deviation or greater represent meaningful changes in people’s experiences; this appears to hold across a variety of measures . We observed ITQOL concept score differences of between a third and a half a standard deviation between feeding regimen groups, differences that are below this clinically meaningful threshold. Although these differences may not be clinically relevant, it is possible that other unmeasured factors such as maternal stress, postpartum depression, sleep quality, or other social determinants of health in the study formula-fed group may have contributed to both the parents’ initial choice of feeding regimens and the slightly lower Parent Impact—Emotional and Parent Impact—Time scores in the study formula-fed group. Likewise, Temperament and Moods may have been lower in the formula-fed group due to the parent’s rationale for initiating formula-feedings or other infant health measures, which this study was not designed to assess. The observed differences in HRQOL may also be due to differences in infant feeding mode (bottle vs. breastfeeding) rather than nutrition (formula or breast milk) or other unmeasured factors.
In general, HRQOL scores for our study population were high, indicating good overall health and well-being in this sample. For comparison, a study in infants 13 months of age with severe asthma-like symptoms reported mean ITQOL concept scores of 61 for Overall Health, 70 for Temperament and Moods, and 66 for Bodily Pain . In addition, the mean SF-12v2 scores of the parents of infants in the present study were close to the expected values for a general adult population (scores are norm-based on the US general population with a mean score of 50 and a standard deviation of ten; scores in Chinese adults have been shown to be very similar [23, 28]). A variety of health-promoting factors contribute to infant well-being, and although decisions about infant feeding are important, their impact may be attenuated in the presence of these other factors. For example, social factors may influence infant well-being (real and/or perceived), and the mean number of adults in the household of infants in this study (~3) suggests a high caregiver-to-infant ratio which may have contributed to high HRQOL scores. Less healthy infants or those in less favorable social conditions may be more sensitive than our study population to the potential effects of feeding regimens on HRQOL. Hence, future research should evaluate the relationship between feeding regimens and HRQOL in other infant populations, especially those with lower HRQOL.
Self-assessed HRQOL is impossible for infants due to their young age. Therefore infant HRQOL can be assessed only by proxy, typically by parental or caregiver report. However the quality of life of the proxy may influence their perception of the infant’s quality of life. In order to address this potential bias, we included maternal quality of life (assessed using SF-12v2 MCS score) as a covariate in the analysis of ITQOL scores across feeding groups. This approach may be broadly applicable to other studies of infant HRQOL, and the use of a single global summary score such as the MCS may be preferred over assessing multiple individual factors (e.g. family income, occupation, and educational level) that may influence parental rating of infant HRQOL.
Our study adds to a limited body of literature assessing the impact of feeding regimen on quality of life in infants. Most published studies have assessed the impact of breastfeeding on parental quality of life and have not evaluated effects on infant quality of life [29–31]. Manificat and Dazord  examined quality of life among 105 infants (mean age 5.7 months) as a function of feeding, using the Quality of Life of the Infant Scale  and reported that maternal overall perception of infant quality of life was independent of the mode of feeding. However, duration of breastfeeding greater than 3 months was associated with higher maternal-reported scores on four items, including infant nervousness, infant anxiousness, family cohesiveness, and infant total quality of life (visual analogue scale) . This finding of differences on some, but not all, items is similar to our results.
Strengths of our study include use of the ITQOL, which was chosen based on extensive review of alternative measures. We chose the ITQOL over other measures [9, 15] because it has been most extensively used, is appropriate for measurement of HRQOL in healthy infants , and provides clearly defined concept scores. The inclusion of a mixed-fed group is an additional strength; most studies exclude this group despite widespread use of mixed feeding regimens and practitioner encouragement of partial breastfeeding when exclusive breastfeeding is not possible . Finally, assessment of HRQOL in both parents and infants is important for appropriate adjustment for the potential confounding influence of parental HRQOL; the correlations between the SF-12v2 and the ITQOL parent-focused concepts highlight the importance of assessing both of these factors.
Limitations of our study include potential lack of generalizability to the overall population of Chinese infants given the high educational level of study parents, inclusion of infants consuming only one type of infant formula, and high HRQOL of study infants. There is also potential for residual confounding in our observational study due to unmeasured factors that influence both choice of feeding regimen and HRQOL. In addition, HRQOL was reported by parents not blinded to feeding regimen; it is possible that reporting of HRQOL was influenced by parents’ beliefs about the effects of feeding regimens on infant HRQOL, rather than based purely on observations of the infant’s well-being. Despite these limitations, our observational approach had the advantage of assessing feeding regimens and their outcomes in real-world settings.
Our study represents an important contribution to the limited literature on infant HRQOL, and highlights the feasibility and utility of measuring HRQOL in this population. We found high HRQOL concept scores in this population of healthy infants, regardless of which feeding regimen parents had chosen. Only a few small differences in HRQOL concept scores were observed between the breastfed, study formula-fed and mixed-fed infants and the effect size of these differences suggests they may be of limited clinical relevance. Furthermore, no significant differences were observed between groups in Overall Health, Physical Abilities, Growth and Development, or Bodily Pain/Discomfort scores, areas where nutrition might be expected to play a role. Based on these results, we conclude that, in this sample of healthy Chinese infants, there was little to no effect of the specific feeding regimens assessed in this study on infant HRQOL. Future research should examine relationships between feeding regimens and HRQOL in other infant populations including those with lower overall health and well-being.
ANCOVA, analysis of covariance; GI, gastrointestinal; HRQOL, health-related quality of life; ITQOL, infant and toddler quality of life questionnaire; MCS, mental component summary; PCS, physical component summary; SF-12v2, short form 12 health survey, version 2; WHO, World Health Organization
This study was sponsored by Nestlé Nutrition. The authors thank the Principal Investigators and research staff at each participating institution: Dr. Meiling Tong, Dr. Yue Qin, Dr. Xianmei Huang, Dr. Zilian Wang, Dr. Qiliang Cui, Dr. Wei Zhou, Dr. Huiming Yang, Dr. Mingxiang Lin, Dr. Xiaoyang Xiong, Dr. Hongyan Qian, Dr. Zhi Li, Dr. Chengzhong Zheng, Dr. Chao Chen, Dr. Ling Fan, Dr. Qian Chen, Dr. Yunmin Zhang, Dr. Bin Wang, Dr. Yan Hu, Dr. Jianhua Sun, Dr. Ruiqin Li, Dr. Mei Zhong, Dr. Keyin Yang, and Dr. Pingping Zhang. The authors also thank Jeanne M. Landgraf for helpful discussions regarding the ITQOL and Kathleen Yerger for assistance with clinical trial management.
Portions of these data were presented in abstract form at the 47th Annual Meeting of the European Society for Paediatric Gastroenterology, Hepatology and Nutrition, Jerusalem, Israel, 9–12 June 2014.
Availability of data and materials
The dataset supporting the conclusions of this article will not be available in a public repository because consent/approval was not obtained for the sharing or publication of subject data from infants’ parents/legal guardians or the Institutional Ethics Committees.
NPH and MY designed the study with input from RN and JG. MM, LZ, and JG conducted the study. RN conducted the data analysis. NPH, MY, RN, and SV made substantial contributions to data interpretation. NPH and SV drafted the final manuscript, with editorial support provided by EpidStat Institute, funded by Nestlé Nutrition. All authors read and approved the final manuscript.
NPH, RN, MY, and SV are employees of Nestlé S.A. JG is an employee of Wyeth Nutritional (China) Company Ltd. MM has received grant/research support from Nestlé Nutrition. LZ has no competing interests to report.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- Victora CG, Bahl R, Barros AJ, Franca GV, Horton S, Krasevec J, Murch S, Sankar MJ, Walker N, Rollins NC. Breastfeeding in the 21st century: epidemiology, mechanisms, and lifelong effect. Lancet. 2016;387(10017):475–90.View ArticlePubMedGoogle Scholar
- Briefing Materials for the Food Advisory Committee Meeting on Infant Formula. http://www.fda.gov/ohrms/dockets/ac/02/briefing/3852b1_01.htm Accessed 29 Jun 2016.
- Spieth LE, Harris CV. Assessment of health-related quality of life in children and adolescents: an integrative review. J Pediatr Psychol. 1996;21(2):175–93.View ArticlePubMedGoogle Scholar
- Iacono G, Merolla R, D’Amico D, Bonci E, Cavataio F, Di Prima L, Scalici C, Indinnimeo L, Averna MR, Carroccio A, et al. Gastrointestinal symptoms in infancy: a population-based prospective study. Dig Liver Dis. 2005;37(6):432–8.View ArticlePubMedGoogle Scholar
- Quinlan PT, Lockton S, Irwin J, Lucas AL. The relationship between stool hardness and stool composition in breast and formula-fed infants. J Pediatr Gastroenterol Nutr. 1995;20(1):81–90.View ArticlePubMedGoogle Scholar
- Bowatte G, Tham R, Allen KJ, Tan DJ, Lau M, Dai X, Lodge CJ. Breastfeeding and childhood acute otitis media: a systematic review and meta-analysis. Acta Paediatr. 2015;104(467):85–95.View ArticlePubMedGoogle Scholar
- Harmsen HJ, Wildeboer-Veloo AC, Raangs GC, Wagendorp AA, Klijn N, Bindels JG, Welling GW. Analysis of intestinal flora development in breast-fed and formula-fed infants by using molecular identification and detection methods. J Pediatr Gastroenterol Nutr. 2000;30:61–7.View ArticlePubMedGoogle Scholar
- Nauta AJ, Ben Amor K, Knol J, Garssen J, van der Beek EM. Relevance of pre- and postnatal nutrition to development and interplay between the microbiota and metabolic and immune systems. Am J Clin Nutr. 2013;98(2):586S–93S.View ArticlePubMedGoogle Scholar
- Manificat S, Dazord A, Langue J, Danjou G, Bauche P, Bovet F, Cubells J, Tockert E, Conway K. Evaluation of the quality of life of the infant and very young child: validation of a questionnaire. Arch Pediatr. 2000;7:605–14.View ArticlePubMedGoogle Scholar
- Yao M, Lien EL, Capeding MR, Fitzgerald M, Ramanujam K, Yuhas R, Northington R, Lebumfacil J, Wang L, DeRusso PA. Effects of term infant formulas containing high sn-2 palmitate with and without oligofructose on stool composition, stool characteristics, and bifidogenicity: a randomized, double-blind, controlled trial. J Pediatr Gastroenterol Nutr. 2014;59(4):440–8.View ArticlePubMedPubMed CentralGoogle Scholar
- Nowacki J, Lee HC, Lien R, Cheng SW, Li ST, Yao M, Northington R, Jan I, Mutungi G. Stool fatty acid soaps, stool consistency and gastrointestinal tolerance in term infants fed infant formulas containing high sn-2 palmitate with or without oligofructose: a double-blind, randomized clinical trial. Nutr J. 2014;13(1):105.View ArticlePubMedPubMed CentralGoogle Scholar
- Kolida S, Tuohy K, Gibson GR. Prebiotic effects of inulin and oligofructose. Br J Nutr. 2002;87 Suppl 2:S193–7.View ArticlePubMedGoogle Scholar
- Closa-Monasterolo R, Gispert-Llaurado M, Luque V, Ferre N, Rubio-Torrents C, Zaragoza-Jordana M, Escribano J. Safety and efficacy of inulin and oligofructose supplementation in infant formula: results from a randomized clinical trial. Clin Nutr. 2013;32(6):918–27.View ArticlePubMedGoogle Scholar
- Grange A, Bekker H, Noyes J, Langley P. Adequacy of health-related quality of life measures in children under 5 years old: a systematic review. J Adv Nurs. 2007;59(3):197–220.View ArticlePubMedGoogle Scholar
- Stein REK, Jessop DJ. Functional Status II (R) - a measure of child health status. Med Care. 1990;28(11):1041–55.View ArticlePubMedGoogle Scholar
- Varni JW, Limbers CA, Neighbors K, Schulz K, Lieu JE, Heffer RW, Tuzinkiewicz K, Mangione-Smith R, Zimmerman JJ, Alonso EM. The PedsQL Infant Scales: feasibility, internal consistency reliability, and validity in healthy and ill infants. Qual Life Res. 2011;20(1):45–55.View ArticlePubMedGoogle Scholar
- Raat H, Landgraf JM, Oostenbrink R, Moll HA, Essink-Bot ML. Reliability and validity of the Infant and Toddler Quality of Life Questionnaire (ITQOL) in a general population and respiratory disease sample. Qual Life Res. 2007;16:445–60.View ArticlePubMedGoogle Scholar
- World Health Organization. WHO child growth standards: length/height-for-age, weight-for-age, weight-for-length, weight-for-height and body mass index-for-age: methods and development. Geneva: World Health Organization; 2006.Google Scholar
- Yerger K, Mao M, Ge J, Northington R, Yao M, Nowacki J, Hays N. Stool characteristics and gastrointestinal tolerance of Chinese infants fed term formula containing increased sn-2 palmitate and oligofructose: an observational study. Arch Dis Child. 2014;99(Suppl 2):A209.View ArticleGoogle Scholar
- Volger S, Hays NP, Northington R, Mao M, Ge J, Landgraf JM. Feasibility and application of the Infant Toddler Quality of Life (ITQOL) in a community-based sample of healthy infants in China. Qual Life Res. 2014;23(1 Suppl):53.Google Scholar
- HealthActCHQ Inc. Confidential scoring rules, Infant and Toddler Quality of Life Questionnaire - 97. Cambridge: HealthActCHQ Inc; 2008.Google Scholar
- Ware Jr J, Kosinski M, Keller SD. A 12-item short-form health survey: construction of scales and preliminary tests of reliability and validity. Med Care. 1996;34(3):220–33.View ArticlePubMedGoogle Scholar
- Lam ET, Lam CL, Fong DY, Huang WW. Is the SF-12 version 2 Health Survey a valid and equivalent substitute for the SF-36 version 2 Health Survey for the Chinese? J Eval Clin Pract. 2013;19(1):200–8.View ArticlePubMedGoogle Scholar
- Saris-Baglama RN, Dewey CJ, Chisholm GB, Plumb E, King J, Rasicot P, Kosinski M, Bjorner JB, Ware Jr JE. QualityMetric Health Outcomes™ scoring software 4.0 User’s guide. Lincoln: QualityMetric Inc.; 2010.Google Scholar
- Nakonezny PA, Shull RD. JMASM 26: Hettmansperger and McKean linear model aligned rank test for the single covariate and one-way ANCOVA case (SAS). J Modern Applied Stat Methods. 2007;6(1):336–40.Google Scholar
- Norman GR, Sloan JA, Wyrwich KW. Interpretation of changes in health-related quality of life: the remarkable universality of half a standard deviation. Med Care. 2003;41(5):582–92.PubMedGoogle Scholar
- Mohangoo AD, de Koning HJ, De Jongste JC, Landgraf JM, van der Wouden JC, Jaddoe VWV, Hofman A, Moll HA, Mackenbach JP, Raat H. Asthma-like symptoms in the first year of life and health-related quality of life at age 12 months: the Generation R study. Qual Life Res. 2012;21(3):545–54.View ArticlePubMedGoogle Scholar
- Lam CLK, Tse EYY, Gandek B. Is the standard SF-12 health survey valid and equivalent for a Chinese population? Qual Life Res. 2005;14:539–47.View ArticlePubMedGoogle Scholar
- Chen YC, Chie WC, Kuo SC, Lin YH, Lin SJ, Chen PC. The association between infant feeding pattern and mother’s quality of life in Taiwan. Qual Life Res. 2007;16(8):1281–8.View ArticlePubMedGoogle Scholar
- Chen YC, Chie WC, Chang PJ, Chuang CH, Lin YH, Lin SJ, Chen PC. Is infant feeding pattern associated with father’s quality of life? Am J Mens Health. 2010;4(4):315–22.View ArticlePubMedGoogle Scholar
- Zubaran C, Foresti K. The correlation between breastfeeding and maternal quality of life in southern Brazil. Breastfeed Med. 2011;6(1):25–30.View ArticlePubMedGoogle Scholar
- Manificat S, Dazord A. [Impact of the mode of breastfeeding on the infant and the quality of life of the mother and the quality of life of the child: results of a pilot study] Impact du mode d'allaitement du nourrisson sur la qualité de vie de la mère et la qualité de vie de l'enfant: Résultats d'une étude pilote. Le Pédiatre. 2000;36(1):17–23.Google Scholar
- American Academy of Family Physicians. Family Physicians Supporting Breastfeeding (Position Paper). http://www.aafp.org/about/policies/all/breastfeeding-support.html Accessed 29 Jun 2016.