Why do newborns smile when they sleep?
The first smiles are reflexive and involuntary acts
As we mentioned earlier, these actions performed by the baby in the womb are considered to be reflex actions. That is, they are an immediate response to a stimulus, which in the case of babies is usually a feeling of internal well-being. Unlike many of us, it’s very likely that babies are actually not aware that they are smiling so we’re talking about an involuntary movement of their muscles, like when they kick or suck their thumb.
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