“孩子气”的拼音为：hái zi qì...

他们那帮孩子野蛮得很，还认为我们太女孩子气。They were rough kids, and thought we were sissies.我女孩子气十足而波莉却像个小男孩。I'm a very girlie person while Polly is one of the lads.别那么孩子气！Don't be so juvenile!...

“孩子气”的英语可以翻译为：childishness，puerility ...