In the first 6 weeks you're getting gas grings (Sorry). But after that, your baby is smiling in reaction to something he sees...Like a favourite toy...or you!
When he's between 3 to 6 months, he'll give you those sweet open-mouthed grins. Prepare to melt. Smiling is amajor social milestone. And those grins will make up for all those sleepless nights.
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