Why do newborns smile when they sleep?
Smiling as a response
Since they cannot talk, both smiling and crying are a baby’s basic means of communication. This is, at least, true during their first moments after birth. However, you should also keep in mind that other separate sets of studies have managed to prove that babies are already social beings days or even hours after being born.
That is why their smiles can also be a response to positive feelings or soothing sensations such as a caress on the cheek or feeling clean again. Pleasant memories, like voices, aromas, and tastes can also trigger a smile on a baby.
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