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婴儿长满牙多少颗
更新时间: 2020-11-04 00:00:00  

婴儿长满牙是20颗。宝宝在两岁半前会长满,这个是乳牙,在宝宝七八岁左右就会换牙。乳牙的萌出遵循着这样一个生理规律:一定时间萌出、一定顺序长出、左右牙齿对称发育。乳牙的下颌牙,比上颌牙先萌出,并是成双成对地萌出,即左右两侧同名的乳牙同时长出。通常,宝宝1岁半时萌出14-16颗乳牙,最后萌出的4颗乳牙是第二乳磨牙。它们紧紧地靠在第一乳磨牙之后。到了宝宝2-2.5岁时,20只小乳牙就全部出齐了,上、下颌各拥有10颗小乳牙。

关键词: 婴儿 多少

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