Methods: 200 healthy babies of full term natural delivery were divided into two groups, experimental group and control group, according to the time of delivery, 100 babies each troup.
方法：将自然分娩的足月正常新生儿200例，按出生顺序分为实验组和对照组，每组100例。
Methods: 200 healthy babies of full term natural delivery were divided into two groups, experimental group and control group, according to the time of delivery, 100 babies each troup.
方法：将自然分娩的足月正常新生儿200例，按出生顺序分为实验组和对照组，每组100例。
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