Department of Child Health, National Center for Maternal and Child Health, Chinese Center for Disease Control and Prevention, Beijing, China.
Zhonghua Er Ke Za Zhi. 2012 Jul;50(7):484-92.
To understand the differences between urban and rural breast-fed infants' growth patterns.
In economically better regions of six provinces in China, 1147 urban and 1058 rural subjects were recruited by the project respectively, and their longitudinal weight, length, and head circumference were measured from birth to 12 months old. The monitoring frequency was 16 times in total. Analysis was conducted to compare the growth patterns between 497 of urban and 764 of rural subjects meeting the breast-fed babies definition by WHO.
During the first year after birth, urban breast-feeding boys' weight, length, head circumference increased by 7.13 kg, 26.9 cm, and 12.4 cm respectively, and 6.60 kg, 26.1 cm, and 11.9 cm for girls. The corresponding values of rural population were 6.70 kg, 25.7 cm and 12.4 cm for boys, and 6.20 kg, 25.0 cm, and 11.8 cm for girls respectively. The gaps existed in the three physical indexes between urban and rural breastfeeding babies were 110 - 480 g, 1.2 - 2.0 cm and 0.1 - 0.6 cm for boys, and 200 - 510 g, 1.3 - 1.7 cm, and 0.4 - 0.6 cm for girls. In about 50% of monitoring age points, monthly increments of urban boy's weight presented higher than rural samples, but only 17% for girl's weight, and boy/girl's length and head circumference.
The urban-rural regional gaps in breast-fed infants' physical development were not optimistic and seemed to be wider in boys than in girls. There are still large room for improvement for growth of infants in rural areas.
了解城乡母乳喂养婴儿生长模式的差异。
在中国六个省份经济较好的地区，该项目分别招募了1147名城市和1058名农村对象，测量他们从出生到12个月大时的纵向体重、身长和头围。监测频率总共为16次。对符合世界卫生组织母乳喂养婴儿定义的497名城市对象和764名农村对象的生长模式进行分析比较。
出生后的第一年，城市母乳喂养男婴的体重、身长、头围分别增加7.13千克、26.9厘米和12.4厘米，女婴分别增加6.60千克、26.1厘米和11.9厘米。农村男童相应数值分别为6.70千克、25.7厘米和12.4厘米，女童分别为6.20千克、25.0厘米和11.8厘米。城乡母乳喂养婴儿三项身体指标的差距，男童为110 - 480克、1.2 - 2.0厘米和0.1 - 0.6厘米，女童为200 - 510克、1.3 - 1.7厘米和0.4 - 0.6厘米。在约50%的监测年龄点，城市男婴体重的月增长量高于农村样本，但女婴体重以及男、女童身长和头围的月增长量仅17%高于农村样本。
母乳喂养婴儿身体发育的城乡区域差距不容乐观，且男童的差距似乎比女童更大。农村地区婴儿的生长仍有很大的改善空间。
