2 sentences

1. 婴儿正含着母亲的奶头吮吸。

   yīng'ér zhèng hán zhe mǔ​qīn de nǎi​tóu shǔn​xī.

   The baby is sucking on the mother's nipple.

   Source: Dong Chinese Dictionary

2. 你应该定期给奶瓶的奶头消毒。

   nǐ yīng​gāi dìng​qī gěi nǎi​píng de nǎi​tóu xiāo​dú.

   You should regularly disinfect the nipple of the baby bottle.

   Source: Dong Chinese Dictionary