Newborns typically exhibit "reflex smiles" shortly after birth, often during sleep or due to internal stimuli like gas. However, their first genuine social smiles usually appear between 6 and 8 weeks of age, occurring in response to external stimuli such as seeing a parent’s face or hearing their voice. By 2 to 3 months old, babies increasingly smile on purpose, showing pleasure and social engagement. These real smiles involve the whole face, especially the eyes, and mark important developmental and social milestones. If a baby is not smiling by around 3 months, it may be advisable to consult a healthcare provider, as smiling is linked to social and emotional development.
