You know when you get new paper bag, you’ll wave it in the air to fluff it up to it’s intended size, before putting things inside. Newborn baby lungs are sorta like that. They gotta take a deep breath to fluff up an unused lung and crying does that. Also, such stretching is said to be painful, so more crying and more stretching, more breathing and more oxygen. lungs of stillborn babies sink cause they aren’t fluffed up.
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