Effect of birth weight on the growth of children under 7 years old
- WU Hua-hong, LI Hui, ZHANG Ya-qin, ZONG Xin-nan
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Objective To investigate the effect of birth weight(BW) on the growth of children under 7 years old,and to explore the effect of intrauterine growth on physical growth in childhond. Methods A cross-sectional study was conducted in nine cities of Beijing,Harbin,Xi′an,Wuhan,Nanjing,Shanghai,Guangzhou,Fuzhou and Kunming from June to October in 2005.A stratified cluster sampling method was used to select 50 076 healthy children in urban areas.The subjects were divided into four groups according to their BW.The growth level,migration degree of growth trajectory and the incidence of short stature,low weight,overweight and obesity were compared among different BW groups. Results 1) Children with higher BW were always at a high growth level.The BW≥4.00 kg group was 3-4 cm higher and 1.5-2.5 kg heavier than BW<3.00 kg group,and the difference was significant (P<0.001).2) There was a neutralization phenomenon on children′s growth trajectory. The height and weight of different BW groups had a large gap in early infancy,and the gap gradually decreased with age. But the degree of migration of the growth trajectory in different groups was different. The height and weight of the group with BW of 2.50 kg- migrated upwards with age,with an average increase of 25.8 and 23.8 percentiles. The growth level of the groups with BW of 3.00 kg- and 3.50 kg- changed less. The height and weight of the BW≥4.00 kg group moved downward,with an average decrease of 34.2 and 31.9 percentiles.3) The detection rates of short stature and underweight in lower BW group were higher,the detection rates of short stature in these four groups were 4.0%,1.8%,1.0%,0.4%,and the underweight rates were 4.9%,2.0%,0.6% and 0.45%.The overweight rates in four groups were 6.0%,10.5%,16.4%,25.7%,obesity rates were 0.9%,1.9%,4.0%,8.3%,respectively,and there were significant differences among the four groups(P<0.001). Conclusion Children with higher BW are always at a high growth level,and the growth trajectory also have a neutralization phenomenon to some extent.However,children with BW higher than 4.0 kg or lower than 3.0 kg should be paid more attention in order to prevent incidence of short stature,wasting,overweight and obesity.