babyish

1. ADJ Babyish actions, feelings, or looks are like a baby's, or are immature. 婴儿一般的; 小孩子气的[usu ADJ n]

...a fat, babyish face. ...一张婴儿肥的脸。

I'm ashamed of the babyish nonsense I write. 我为我写出幼稚的话感到丢脸。