The baby is three months old.

这婴儿三个月大了。

《牛津词典》

Solstice is three months old in this shot.

图片里的索斯提斯有三个月大。

youdao

Once they're three months old, geladas ride their mothers jockey-style.

小狒狒三个月大时就可以骑在妈妈背上了。

youdao

His family moved to Texas when he was only three months old.

VOA: special.2010.03.17

This thing this new invention is three months old at this point.

在此刻，这一新的发明却,已经有三个月的历史了。

耶鲁公开课 - 金融市场课程节选

EJ Davis,4,was only three-months-old when he underwent open heart surgery.

VOA: standard.2010.01.01

Cous Cous once appeared on Ellen DeGeneres' television show when he was about three months old.

CNN: STORY HIGHLIGHTS

"He's been flying since he was three months old, " Tony Thompson tells CNN.

CNN: Pirates, wars: Hurdles for flight phobia boy

Dr Smith has bred about 3, 000 spiders in her kitchen in individual test tubes until they were three months old.

BBC: Rare fen raft spiders breeding in Suffolk