Social smile

The social smile is a developmental milestone observed in _________ ___ _________ _______ ____ ______ _______.
_____ _________ _______ __________ ________ __________ ___ ___ ___.
___ _______ _________ ____ ___ _________ _______ ________ _______.
_____ __________ _______ __________ ______ _________ ___ _____ ___.
_______ __________ __________ ______ __________ ____ ___ ________ ____.
__________ _____ ________ _______ ________ __________.
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