長(zhǎng)牙會(huì)很難受，嬰兒會(huì)煩躁不安。Teething can be painful and make your baby irritable.我的小弟弟直發(fā)脾氣,因?yàn)檎陂L(zhǎng)牙.My brother is fretful because he is cutting his teeth.很多嬰兒到一歲大時(shí)才開始長(zhǎng)牙。Many infants do not cut their first tooth until they are a year ol...