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婴儿一共多少牙齿
更新时间： 2020-11-04 00:00:00  

婴儿一共20颗乳牙，一般从六个月开始萌发乳牙，由下颚前门齿先萌牙。有时个体差异因早熟或晚熟会有1-2年的发育差别，另外有人先天多长牙，也有人缺牙，牙齿的数目也会有异常现象。

关键词： 婴儿 一共 多少 牙齿

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