Waite Whitney M, Christakis Dimitri
Center for Child Health, Behavior, and Development, Seattle Children's Research Institute, University of Washington , Seattle, Washington.
Breastfeed Med. 2016 Jan-Feb;11(1):21-5. doi: 10.1089/bfm.2015.0099. Epub 2015 Dec 24.
Decades of research supports the health benefits of breastfeeding. Prior studies have shown that hospital discharge bags containing free samples of infant formula are associated with decreased breastfeeding exclusivity. This study aims to determine if receiving a free sample of infant formula in the mail has an impact on breastfeeding duration and exclusivity.
This was a cohort study analyzing data from the Infant Feeding Practices Study II. The main outcomes of interest were any breastfeeding through 12 months of age and exclusive breastfeeding through 6 months of age. The main predictor of interest was receipt of a free sample of infant formula in the mail around the time of the infant's birth. Logistic regression models were developed to evaluate the association between the outcomes and predictor of interest at each month.
This study included 3,031 infants; mothers of 1,741 (57.4%) received a sample of infant formula in the mail. There was no difference in the likelihood of any breastfeeding at each month among those who received formula in the mail compared with those who did not. There was also no difference in exclusive breastfeeding through 5 months; however, by 6 months of age infants whose mothers received formula in the mail were less likely to be exclusively breastfed (odds ratio = 0.57; 95% confidence interval, 0.37, 0.89).
Receiving infant formula in the mail decreases the likelihood of exclusive breastfeeding by 6 months of age while having no impact on the duration of any breastfeeding.
数十年的研究证实了母乳喂养对健康有益。先前的研究表明，装有婴儿配方奶粉免费样品的出院包与纯母乳喂养率降低有关。本研究旨在确定收到邮寄的婴儿配方奶粉免费样品是否会对母乳喂养的持续时间和纯母乳喂养率产生影响。
这是一项队列研究，分析了来自婴儿喂养实践研究II的数据。主要关注的结果是12个月龄时的任何母乳喂养情况以及6个月龄时的纯母乳喂养情况。主要关注的预测因素是婴儿出生前后收到邮寄的婴儿配方奶粉免费样品。建立逻辑回归模型以评估每个月结果与关注预测因素之间的关联。
本研究纳入了3031名婴儿；1741名（57.4%）婴儿的母亲收到了邮寄的婴儿配方奶粉样品。与未收到配方奶粉的母亲相比，收到配方奶粉的母亲在每个月进行任何母乳喂养的可能性没有差异。在5个月龄时的纯母乳喂养情况也没有差异；然而，到6个月龄时，母亲收到配方奶粉的婴儿进行纯母乳喂养的可能性较小（优势比=0.57；95%置信区间，0.37，0.89）。
收到邮寄的婴儿配方奶粉会降低6个月龄时纯母乳喂养的可能性，而对任何母乳喂养的持续时间没有影响。
