Barros F C, Victora C G, Vaughan J P
Acta Paediatr Scand. 1986 Jul;75(4):558-62. doi: 10.1111/j.1651-2227.1986.tb10250.x.
Patterns of breastfeeding were studied in a cohort of 5 914 infants followed from birth in Pelotas, Southern Brazil. Overall, 92% of the babies commenced breastfeeding and 54% were still breastfed by 3 months of age. This proportion dropped to 30% by 6 months, 20% by 9 months, and 16% by 12 months. The prevalence of breastfeeding soon after birth, and at 3, 6, 9 and 12 months of age was studied according to socioeconomic status as measured by family income. Children from the poorest families were less likely to be breastfed from birth than those from the richest families (89% and 97%, respectively), and also showed lower prevalence of breastfeeding at 3 and 6 months. By the age of 12 months poor children showed the highest prevalence of breastfeeding.
在巴西南部佩洛塔斯，对5914名从出生起就进行跟踪研究的婴儿队列的母乳喂养模式进行了研究。总体而言，92%的婴儿开始母乳喂养，到3个月大时，54%的婴儿仍在接受母乳喂养。这一比例在6个月时降至30%，9个月时降至20%，12个月时降至16%。根据家庭收入衡量的社会经济地位，研究了出生后不久以及3、6、9和12个月大时的母乳喂养率。最贫困家庭的孩子从出生起就比最富裕家庭的孩子接受母乳喂养的可能性小（分别为89%和97%），并且在3个月和6个月时的母乳喂养率也较低。到12个月大时，贫困儿童的母乳喂养率最高。
