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並前往https://www.colgate.com/en-us/oral-health/infant-oral-care/babys-first-laugh-how-to-get-your-infant-to-giggle

Baby's First Laugh: How To Get Your Infant To Giggle - Colgate

While your baby will make noises and some facial interactions from birth, a social smile will begin to develop around three months of age. By four months, your ...

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