During the phase of deeper sleep known as Rapid Eye Movement (REM) sleep, babies may twitch, make reflexive facial expressions, and even breathe differently. The adorable smiles your newborn makes in their sleep aren’t actually caused by sweet dreams-those are reflexive smiles, too. ![]() These reflex smiles may occur during naps or after feedings.įleeting expressions that resemble smiles are most likely reflexive facial movements. ![]() In a newborn, this type of facial expression may look like a smirk, with one or both corners of their mouth slightly raised. Reflex smiling and smirkingīefore your baby’s first social smile, you may notice fleeting expressions that resemble smiles. With a genuine social smile, your baby’s eyes may light up and they may even wiggle and squeal. Social smiles last longer and are generally in response to something-like your touch, your voice, or your smile. Some researchers suggest that these may be early social smiles, but most believe this kind of facial movement is reflexive.īy the time your baby is 2 to 4 months old, they may smile briefly as a social gesture. ![]() When they are 5 to 8 weeks old, you may start to see your baby’s first smiles. When should I worry about my baby not smiling?.But just how early might you see one-and is it a “true” smile? Here’s what to know about your baby’s first smile, including how to encourage more of them □ Your baby’s first smile is a moment you’ll never forget.
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