This supplemental issue of Pediatrics presents the first set of results from the Infant Feeding Practices Study II (IFPS II), which were chosen to cover a wide range of the topics included in the study. The IFPS II was conducted collaboratively by the Food and Drug Administration and the Centers for Disease Control and Prevention (CDC) and was co-funded by other agencies in the Department of Health and Human Services, as indicated in “Acknowledgments.”
The design of the IFPS II was similar to that of the original study (the IFPS I), which was conducted in 1992–1993. In the current longitudinal survey, a large cohort of 4900 women was enrolled prenatally, and >2000 were followed through the first year of their infant's life. The mothers were mailed 1 prenatal and 10 postnatal questionnaires at approximate monthly intervals; in addition, prenatal and postnatal subsamples were administered a dietary intake questionnaire. The questionnaires were modeled on the IFPS I, but the IFPS II included several new topics such as postpartum depression, consumption of herbal and alternative medicines, breast-pump use, and infant sleeping arrangements. The details of the study methods and a list of publications from the IFPS I are presented in an article by Fein et al1 in this supplement.
Why an IFPS II? In the decade since the IFPS I, significant changes have occurred in the products, policies, information, and education related to infant feeding choices. Breast pumps have become more effective and more affordable; new ingredients have been added to infant formula; and changes in state and federal laws have reduced some barriers to breastfeeding. Policies and recommendations about infant feeding (duration and exclusivity) have changed. In 2004–2006, the Department of Health and Human Services conducted a national breastfeeding-promotion campaign, the impact of which had to be evaluated. Thus, the IFPS II was conducted to better understand current infant feeding practices approximately 1 decade after the IFPS I.
The 13 articles in this supplement provide results on several feeding issues: breastfeeding patterns, intensity, and duration; reasons for stopping breastfeeding; and transitional and complementary feeding, including provision of iron-rich foods and supplements to breastfed infants. They examine the association between mothers’ behaviors with respect to their infants’ feeding and mothers’ interface with certain types of organizations that may support or limit their choices, including the maternity care practices of the place at which they delivered and the breastfeeding-related options associated with their place of employment. The articles also describe and analyze patterns of breast milk expression; infant formula handling practices; infant sleeping arrangements; and food-related health problems including food allergy. Another article analyzes the effects of breastfeeding intensity, infant-initiated bottle emptying, and mothers’ encouragement of bottle emptying on excess weight during infancy.
Several of the articles examine mothers’ adherence to recommendations for infant feeding and care. The authors found that although most mothers generally adhered to the recommendations, a substantial minority of mothers did not. Shealy et al2 found large variation from common advice on breastfeeding practices, such as the length of feeds and feeding from both breasts, and also found that a small percentage of breastfeeding mothers (∼6%) never put their infant to their breast (ie, only fed their infants expressed breast milk). The authors discuss the possible implications of these variations in breastfeeding practices. Grummer-Strawn et al3 report that nearly half of the breastfed infants were supplemented with infant formula in the hospital and discuss the importance of only supplementing in the hospital when medically necessary. They found that nearly half of the infants were being fed solid foods before the age of 4 months and that more than half of the infants consumed foods high in fat or sugar at 1 year of age.
Fein et al4 examined adherence to several recommendations and healthful patterns related to feeding complementary foods, including 5 measures of timing of feeding various complementary foods, 7 measures of diet quality, and the first documentation in a national sample of the practice of prechewing food for infants, estimated at 14% in this sample. In a detailed examination of 1 aspect of complementary feeding, Dee et al5 describe adherence to recommendations made to ensure that breastfed term and preterm infants receive adequate iron and conclude that a substantial proportion of the mothers did not follow these recommendations. They found that 58% of breastfed 6-month-old infants received neither 2 servings per day of infant cereal, meat, or iron-fortified infant formula combined nor an oral iron supplement regularly. They also found that nearly all mothers who fed their 6-month-old infants formula (in addition to breast milk) used iron-fortified formula. In an examination of infant formula issues, Labiner-Wolfe et al6 found that most mothers believed that the 3 forms of infant formula (powdered, liquid concentrate, and ready-to-feed) are equally likely to contain germs, although powdered formula is not a commercially sterile product and the other forms are. Although almost all the mothers reported that they followed the recommendation not to leave prepared infant formula at room temperature for >2 hours, more than half of the mothers reported that they did not always wash their hands before preparing their infant's formula, and one third did not always wash bottle nipples between uses.
Hauck et al7 examined the sleeping arrangements of infants and document that one quarter of 3-month-old infants were not placed on their back as recommended by the Back to Sleep campaign and that bed sharing, defined as a mother sleeping with her infant on the same surface, was quite common (34% at 3 months of age). They also describe reasons mothers do and do not lie down or sleep with their infants and report that the major reasons for bed sharing with the infant were to calm a fussy infant, facilitate breastfeeding, and help the infant and/or mother sleep better. The most frequently given reason for not lying down with the infant was concern that it was unsafe.
Two articles examine the effects on breastfeeding of characteristics of mothers’ interface with certain types of organizations. In an article on hospital practices, DiGirolamo et al8 show that only 8% of the mothers experienced all 6 of the Baby-Friendly hospital practices measured in this study and that continuation of breastfeeding to 6 weeks was much higher among mothers who experienced a greater number of those practices. Fein et al9 examined the association between breastfeeding and various strategies that mothers used to combine breastfeeding and employment, an aspect of breastfeeding and working that has not been documented previously. They found that any of 3 strategies that provided milk for the infant during the work day (pumping milk only, breastfeeding directly only, pumping and breastfeeding directly) were equally effective and superior to the strategies that did not provide milk for the infant (pumping and dumping the milk or neither pumping nor breastfeeding during the work day) for maintaining breastfeeding intensity in the month after the mother returned to work. However, feeding the infant directly from the breast during the workday, either alone or in combination with pumping milk, was associated with longer breastfeeding duration after return to work than pumping only, whereas the shortest duration was observed among those who neither pumped nor breastfed during the work day.
Four articles concern a variety of other issues related to infant feeding. Li et al,10 examining reasons that mothers stopped breastfeeding, found that the mother's perception that the infant was not satisfied by breast milk alone was among the most frequently reported reasons for weaning regardless of age. Other reasons, such as issues related to lactation physiology and self-weaning, varied according to weaning age. Labiner-Wolfe et al11 documented for the first time in the literature the characteristics of milk expression. A very large proportion of breastfeeding mothers expressed milk (85%), and approximately one quarter did so regularly. Labiner-Wolfe et al found that the most frequently reported reason for expressing milk across multiple infant ages was to have breast milk for someone else to feed to the infant. Other frequently cited reasons in all age groups were to have an emergency milk supply and to relieve engorgement. Li et al12 used the data to examine an obesity-related issue: the association between breastfeeding intensity and bottle-emptying behaviors during early infancy and infants’ risk for excess weight at late infancy. They found that excess weight at late infancy was negatively associated with breastfeeding intensity but positively associated with infant-initiated bottle emptying in the first half of infancy.
Luccioli et al13 describe the details of the mothers’ reports of food-related health problems, including food allergy, in their infants. More than 20% of the infants were reported to have a food-related health problem, with ∼6% having an apparent food allergy. They also found that the majority of affected infants developed food-related health problems by 6 months of age. However, only 40% of affected infants received a doctor-given diagnosis of the food problem. They concluded that a better understanding of disease manifestations and diagnoses in infants may help to differentiate food allergies from other food-related health problems in this age group.
This set of articles provides insight into a wide range of practical issues that affect mothers and infants. However, we believe that this is only the beginning; the data sets from the IFPS II are available from the CDC (www.cdc.gov/ifps) for the scientific community to pursue additional analyses and research using this rich source of information.
We thank the following funding agencies within the Department of Health and Human Services that made the study possible: Food and Drug Administration; Centers for Disease Control and Prevention; Office of Women's Health (Department of Health and Human Services); Eunice Kennedy Shriver National Institute of Child Health and Human Development, Office of Dietary Supplements, and National Cancer Institute (National Institutes of Health); and the Maternal and Child Health Bureau (Health Services and Resources Administration). We also acknowledge additional scientific support provided by the Economic Research Service and the Food and Nutrition Service (United States Department of Agriculture).
The IFPS II was conducted under the general direction of Dr Fein in collaboration with Dr Grummer-Strawn. The catalyst for initiating the study was Dr Suzanne Haynes, Office of Women's Health, Department of Health and Human Services. We thank all study participants and their families and all authors of the articles. We give special thanks to Dr Ruowei Li and Jian Chen of CDC for devoting endless hours to data cleaning, Dr Judith Labiner-Wolfe for ably serving as associate project director at FDA, Katherine R. Shealy of the CDC for her subject matter expertise during the questionnaire development phase, Jian Zhang of CDC for his sophisticated programming and significant data tabulation, and Dr Steve Bradbard, Consumer Studies Staff Team Leader, FDA, who supported the project to the fullest extent.
- Accepted June 4, 2008.
- Address correspondence to Sara B. Fein, PhD, Food and Drug Administration, Center for Food Safety and Applied Nutrition, 5100 Paint Branch Pkwy, HFS 020, College Park, MD 20740. E-mail:
The authors have indicated they have no financial relationships relevant to this article to disclose.
- ↵Fein SB, Labiner-Wolfe J, Shealy KR, Li R, Chen J, Grummer-Strawn LM. Infant Feeding Practices Study II: study methods. Pediatrics.2008;122 (suppl 2):S28– S35
- ↵Shealy KR, Scanlon KS, Labiner-Wolfe J, Fein SB, Grummer-Strawn LM. Characteristics of breastfeeding practices among US mothers. Pediatrics.2008;122 (suppl 2):S50– S55
- ↵Grummer-Strawn LM, Scanlon KS, Fein SB. Infant feeding and feeding transitions during the first year of life. Pediatrics.2008;122 (suppl 2):S36– S42
- ↵Fein SB, Labiner-Wolfe J, Scanlon KS, Grummer-Strawn LM. Selected complementary feeding practices and their association with maternal education. Pediatrics.2008;122 (suppl 2):S91– S97
- ↵Dee DL, Sharma AJ, Cogswell ME, Grummer-Strawn LM, Fein SB, Scanlon KS. Sources of supplemental iron among breastfed infants during the first year of life. Pediatrics.2008;122 (suppl 2):S98– S104
- ↵Labiner-Wolfe J, Fein SB, Shealy KR. Infant formula–handling education and safety. Pediatrics.2008;122 (suppl 2):S85– S90
- ↵Hauck FR, Signore C, Fein SB, Raju TNK. Infant sleeping arrangements and practices during the first year of life. Pediatrics.2008;122 (suppl 2):S113– S120
- ↵DiGirolamo AM, Grummer-Strawn LM, Fein SB. Effect of maternity-care practices on breastfeeding. Pediatrics.2008;122 (suppl 2):S43– S49
- ↵Fein SB, Mandal B, Roe BE. Success of strategies for combining employment and breastfeeding. Pediatrics.2008;122 (suppl 2):S56– S62
- ↵Li R, Fein SB, Chen J, Grummer-Strawn LM. Why mothers stop breastfeeding: mothers’ self-reported reasons for stopping during the first year. Pediatrics.2008;122 (suppl 2):S69– S76
- ↵Labiner-Wolfe J, Fein SB, Shealy K, Wang C. Prevalence of breast milk expression and associated factors. Pediatrics.2008;122 (suppl 2):S63– S68
- ↵Li R, Fein SB, Grummer-Strawn LM. Association of breastfeeding intensity and bottle-emptying behaviors at early infancy with infants’ risk for excess weight at late infancy. Pediatrics.2008;122 (suppl 2):S77– S84
- ↵Luccioli S, Ross M, Labiner-Wolfe J, Fein SB. Maternally reported food allergies and other food-related health problems in infants: characteristics and associated factors. Pediatrics.2008;122 (suppl 2):S105– S112
- Copyright © 2008 by the American Academy of Pediatrics