Reflexive Smiles Answers · Maars

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Why do babies smile in their sleep?
Learn why babies smile in their sleep, from active REM sleep and reflexes to simple physical sensations, and when social smiles begin.
Why do babies smile in their sleep?
Learn why babies smile in their sleep, from active REM sleep and reflexes to simple physical sensations, and when social smiles begin.
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Best Answer95% confidence95%May 31, 2026

Best Answer95% confidenceMay 31, 2026

Reflexive Smiles Answers · Maars

Explore reflexive smiles with clear explainers, related comparisons, and community Q&A about why babies smile in their sleep and what it can mean.