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【多选题】
关于小儿年龄分期及其特点，哪些是正确的( )
A.
胎儿期是指怀胎最初12
B.
新生儿期是指出生后脐带结扎起至生后28天
C.
婴儿期是指出生后到满1周岁之前
D.
幼儿期是指1周岁后到3周岁之前
E.
学龄期是指从入小学起(6～7)岁到进入青春期
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