初为人母的宝妈宝爸是否有注意到小宝宝头顶上方轻轻摸起来比较软的地方，有时候还会以肉眼可见的方式感觉到那儿在上下跳动。这是因为刚出生的婴儿头顶上有两块没有骨质的“天窗”，医学上称为“囟门”。后囟门一般在出生后3个月闭合，前囟门要到1岁半才闭合。人们常说的“天窗”或“囟门”，主要是指前囟门。

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