婴儿 (yīng'ér) means "baby" or "infant." It refers to a very young child, typically under one year of age, and is used in both everyday and formal contexts such as medical or legal discussions.
这家医院的婴儿护理很专业。
Zhè jiā yīyuàn de yīng'ér hùlǐ hěn zhuānyè.
This hospital's infant care is very professional.
婴儿一般六个月左右开始长牙。
Yīng'ér yìbān liù gè yuè zuǒyòu kāishǐ zhǎng yá.
Babies generally start teething around six months.
她抱着婴儿轻轻地唱歌。
Tā bào zhe yīng'ér qīngqīng de chànggē.
She held the baby and sang softly.