babyish

1. ADJ Babyish actions, feelings, or looks are like a baby's, or are immature. 嬰兒一般的; 小孩子氣的[usu ADJ n]

...a fat, babyish face. ...一張嬰兒肥的臉。

I'm ashamed of the babyish nonsense I write. 我爲我寫出幼稚的話感到丟臉。