儿童年龄分期/ classification of children by age and the characteristics of each period /classification of children by age and the characteristics of each period
儿童年龄分期及各期特点从胎儿到青春期之间可划分为多个时期，每个时期都有特殊之处及需要注意的事项。宫内宫外环境的转换/ intra-uteral to post-natal environment transition /intra-uteral to post-natal environment transition
儿童年龄分期及各期特点怀孕第28周到出生后1周的胎儿和新生儿，经历的从子宫内分娩到子宫外的环境变化。
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