医生：（笑）能怪我吗？
婴儿从出生就会笑：大多数医生认为，4 - 6周的婴儿醒着时会发出真正的笑容，但其实，婴儿一出生，就会在睡着的时候笑。
Babies start smiling as newborns: Most doctors believe that real smiles occur when babies are awake at the age of four-to-six weeks, but babies start smiling in their sleep as soon as they're born.
他们会因为医生搔他们的痒而笑。
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