The signalling function of their baby's facial expressions becomes apparent to most parents when the baby is about 12 months old.

Name: The signalling function of their baby's facial expressions becomes apparent to most parents when the baby is about 12 months old.
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Most parents begin to recognize the signaling function of their baby's facial expressions much earlier, typically around 3 to 6 months of age, as babies start to show more varied and intentional expressions.

The Signalling Function of Their Baby's Facial Expressions Becomes Apparent