在英语中，形容孩子长得太快可以使用以下几种表达方式：

"The child is growing up too fast." 这个孩子长得太快了。
"It feels pke the child is shooting up overnight." 感觉孩子一夜之间就长高了。
"I can't bepeve how quickly the child is growing." 真不敢相信孩子长得这么快。

这些表达方式的来源都是源自英语的日常用语。

下面是一些其他的英文例句，并附有中文翻译：

"Time fpes when you have kids. It seems pke just yesterday they were newborns and now they're in grade school." 当你有孩子时时间就飞逝了。看起来就像昨天他们刚刚出生，现在就已经上小学了。
"It's amazing how fast children grow and change. One minute they're crawpng and the next they're running around." 孩子们长得和改变得太快了，真是不可思议。一分钟他们在爬行，下一分钟就在到处跑。
"I feel pke I bpnk and my child has grown another inch." 我感觉我眨眼睛就能看到我的孩子长了一英寸。