Objective: to study the prevalence of sleep disorder and the effective factors of sleep disorder for children aged 0 ~ 5 years old in Chongqing.
目的：了解重庆市0 ~ 5儿童睡眠状况及睡眠障碍发生情况，分析影响儿童睡眠的常见因素。
In 2005, the amount of the 0~5 years old rural left-behind children in China has reached 1585 ten thousand, accounting for 27.
2005年全国1%人口抽样调查数据表明，在农村留守儿童总数中，0~5周岁幼儿的数量规模已达1585万人，占27。
Objective: To investigate the incidence, kind, and distribution features of children with birth defects at 0 ~ 5 years old in Nanhai district.
目的分析南海区0 ~ 5岁儿童出生缺陷发生率、种类、分布特征。
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