“吃奶”的拼音为：chī nǎi...

婴儿渴的时候，吃奶就会更频繁。When a baby is thirsty, it feeds more often.给小牛吃奶的母牛a cow suckling her calves那个小孩四个月以后就不吃奶了.The child did not nurse after he was four months old....

“吃奶”的英语可以翻译为：suck (the breast) ...