新生婴儿通常没有牙齿.在大约六个月大的时候,婴儿的前牙开始发育.总共有20颗牙齿.前牙用来咬断食物,后面的两颗大牙则用来磨碎食物.这使得食物很容易下咽.如果不用牙刷清理干净,粘性的以及糖分很多的食物很容易使牙齿上长洞.当孩子长到六七岁的时候,奶牙开始脱落.新牙就永远长在奶牙脱落的地方.
英语翻译翻译这篇短文.Newborn babies do not usually any teeth.Their fro
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