Abstract: Objective To examine the relationship of exclusive breastfeeding (BF) with infant weight in urban areas of China. Methods The survey was conducted in 17 provincial and municipal MCH of China.The data in this study were collected from 465 parents of normal birth-weight babies aged 9~13 months.The self-administered questionnaire was designed about feeding-practices in the first six months and the growth of the first year.According to the duration of exclusive BF, the indicators of weight for height (WLZ), age for BMI (BMIz), weight for age (WAZ) and weight gain in different groups were compared. Results Duration of BF from 0 to 6 months, the proportion of WLZ>+2s were 11.11%, 8.11%, 15.79%, 7.79%, 5.13%, 4.88% and 2.70%.The proportion of WLZ>+2s in BF <4 months group was higher than that in BF 4~6 months group (12.02% & 5.60%), and the difference was statistically significant (P<0.05).There was a similar trend in BMIz and WAZ.Logistic regression showed duration of BF significantly influenced the weight of babies in 1 years old. Conclusion The incidence of obesity at 1-year-old decrease with the duration of BF in the first six months, and BF may be a protective factor for preventing obesity of infants.

Key words: breast-feeding, physical indicators, obesity, infant

摘要： 目的 探讨我国城市地区婴儿体重相关指标与纯母乳喂养时间的关系。方法 以2011年在全国17所省市级妇幼保健院调查的465例9~13月龄正常足月儿童为研究对象。采用自拟调查问卷了解儿童6个月内喂养方式和1岁左右的体格发育情况。比较不同纯母乳喂养时间的儿童, 身长别体重Z值(weight for height Z-score, WLZ)、年龄别BMI Z值(BMIz)和年龄别体重Z值(weight for age Z-score, WAZ)中>+2s的发生情况。结果 纯母乳喂养0~6个月的婴儿在1岁左右肥胖的发生率(据WLZ>+2s)依次为12.35%、13.51%、15.79%、9.09%、6.84%、4.88%和4.05%;纯母乳喂养<4个月组婴儿1岁左右肥胖发生率(12.02%)高于纯母乳喂养4~6个月组 (5.60%), 差异有统计学意义(P<0.05)。BMIz、WAZ也表现为类似的趋势。Logistic回归分析显示纯母乳喂养时间对婴儿体重有显著影响。结论 婴儿1岁左右肥胖发生率随6个月内纯母乳喂养时间延长而降低, 纯母乳喂养时间长对于婴儿肥胖可能有预防保护作用。

关键词: 母乳喂养, 体格测量指标, 肥胖, 婴儿