We never saw our baby smile.

我们从未见过我们的孩子微笑；

youdao

She talked about breast-feeding, sleepless nights and Miles's sweet baby smile.

她说起母乳喂养，不眠不休的夜晚以及迈尔斯甜美的婴儿微笑。

youdao

When a woman sees her baby smile, the dopaminergic reward system of her brain activates, stimulating happy feelings, a recent US study shows.

美国最近一项研究发现，当母亲看到自己婴儿的微笑时，大脑中的多巴胺奖励体系被激活，从而感受到幸福。

youdao

The smile on her face was unbelievable, she was just a lovely little girl, my baby.

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