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胎儿自妊娠20周起就开始形成皮下脂肪,至出生时皮下脂肪已相当丰满。各个不同胎龄新生儿的出生体重、身长以及身体
Fetus from the 20th week of pregnancy began to form subcutaneous fat, subcutaneous fat at birth has been quite full. The birth weight, length and body of newborns of different gestational age