Respiratory therapist here! Crying allows them to clear amniotic fluid from their lungs, as well as expand the lungs so that the air sacs (alveoli) can start working. If a newborn baby doesn’t breathe well when they come out, we’ll often give them CPAP to help expand their lungs instead. Crying helps with babies’ functional residual capacity, which is the amount of air that stays in the lungs after exhalation. Keeping the lungs the right amount of “inflated” is imperative to the success of the baby after birth.
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