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BBC
4 年
When do babies start laughing and what do they laugh at?
Newborn babies do not smile in response to something that makes them happy. It’s actually in the second month that you will likely see your baby’s first real smile. It's sometimes called a ...
Baby Center on MSN
18 天
When do babies start smiling?
Newborns exhibit reflex smiles as soon as they're born, but true social smiles don't typically start until 8 weeks. Babies ...
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