Cunningham A S
J Pediatr. 1977 May;90(5):726-9. doi: 10.1016/s0022-3476(77)81236-5.
One-half of the healthy newborn infants at a rural medical center were initially breast fed; the proportion declined to 4% by one year of age. Breast-feeding was associated with significantly less illnes during the first year, especially if continued beyond 41/2 months of age. Breat-fedding was associated with a higher level of parental education and, by inference, higher socioeconomic status. The health advantage of breast-feeding was still evident after controlling for parental educational status. In better educated families the difference in significant illness between infants who were artifically fed and those who were breast fed for prolonged periods of time was two- to threefold.
一家乡村医疗中心一半的健康新生儿最初采用母乳喂养；到一岁时，这一比例降至4%。母乳喂养在第一年与明显较少的疾病相关，尤其是如果持续超过4个半月。母乳喂养与更高的父母教育水平相关，由此推断，社会经济地位也更高。在控制了父母教育状况后，母乳喂养的健康优势仍然明显。在受教育程度较高的家庭中，人工喂养的婴儿和长期母乳喂养的婴儿在重大疾病方面的差异是两到三倍。
