The baby is three months old.

这婴儿三个月大了。

《牛津词典》

Her baby is two weeks overdue.

她的胎儿已超过预产期两周了。

《牛津词典》

The baby is very mentally alert.

这孩子脑子很机灵。

《牛津词典》

Women are also advised to continue treatment through the recommended end of breastfeeding, when the baby is one year old.

VOA: special.2009.12.02

The baby is being approached, goes like this , smiles like this , and then the aversion .

有人走近这个婴儿，像这样，眉毛上挑凝视，开始微笑，像这样笑，大笑头偏向左，然后是讨厌的人，大笑头避开。

耶鲁公开课 - 心理学导论课程节选

And because of operant conditioning, the baby is driven towards the adult.

因为操作性条件作用，婴儿跟着成年人。

耶鲁公开课 - 心理学导论课程节选

Unlike early versions of convertibles from the early 2000s, the hinge on this baby is solid.

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Now that baby is starting school next month, and the "big story" is still going strong.

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That Lady Grantham slipped on her soap and lost the baby is no secret, after all.

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