Martinez G A, Nalezienski J P
Pediatrics. 1981 Feb;67(2):260-3.
This study presents results of surveys conducted on a continuous basis over a period of years to determine the trend in the incidence of breast-feeding. Questionnaires were mailed to large samples of mothers, representative of the national distribution of births, asking them what type of milk they fed their infants over a period of time. Demographic characteristics of mothers who breast-fed were also obtained. From 1955 to 1971, there was a progressive decline in breast-feeding, followed by a resurgence of its incidence through 1979. Not only are more mothers breast-feeding, more are continuing to do so for a longer period of time throughout the months of their infants' most rapid growth and high nutritional requirements. It is also apparent that the increased incidence of breast-feeding has not been limited to higher income, better educated mothers.
本研究展示了多年来持续进行的调查结果，以确定母乳喂养发生率的趋势。调查问卷被邮寄给大量具有全国出生人口代表性的母亲样本，询问她们在一段时间内用何种类型的乳汁喂养婴儿。还获取了进行母乳喂养的母亲的人口统计学特征。从1955年到1971年，母乳喂养呈逐渐下降趋势，随后到1979年其发生率又有所回升。不仅进行母乳喂养的母亲增多了，而且在婴儿生长最迅速、营养需求最高的几个月里，更多母亲持续母乳喂养的时间也更长了。同样明显的是，母乳喂养发生率的增加并不局限于高收入、受过良好教育的母亲。
