A bit more context. When the baby comes out it usually comes out head first. That means the baby’s head and face will come out before the rest of the body. But what I want to know is why when the entire head and face is out but not the body it dosent dosen’t cry but when the entire body comes out it starts crying. Sorry for weird wording, I’m not that good at explaining stuff. Also sorry if this is against the rules. It’s not my intent to be weird or anything, I’m just curious.
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Basically by the time the head and neck is out, they pull the shoulders out and the whole things out. It’s the crowning and the getting to that point that takes forever. It’s not like there’s a baby head and neck sticking out for any real period of time. And the babies cry basically as soon as their lungs can suck in air and allow them to cry. So sometime they do make noise while still being pulled from the birth canal.
Also not all babies cry on their own. Most do, because of the shock of the cold air and whatnot and the whole birth process, but some don’t. Hence the idea that a dr had to slap you on your bottom to get you to cry back in the day to see if you had healthy lungs.
I’m not a dr and only have one kid but she came out of me and I have hella friends with kids so this is how it works *to my understanding*.
At birth, the baby’s lungs are filled with fluid. They are not inflated. The baby takes the first breath within about 10 seconds after delivery. This breath sounds like a gasp, as the newborn’s central nervous system reacts to the sudden change in temperature and environment.
When the baby is inside the womb its lungs are filled with fluid that’s oxygen rich and the umbilical cord shares oxygen and nutrients rich fluid. When the baby comes out its lungs arent used to breathing air and the lungs are very weak so screaming is one of the easiest ways to clear the lungs and get the diaphragm moving in a rhythm that allows the lungs to start getting oxygen to the bloodstream.
Fun fact: the movie the abyss where the deep sea diving scenes had the characters breathing in liquid oxygen is not complete science fiction. They were experimenting with humans breathing PFC chemicals, I dont recall the specific kind but basically an inert nontoxic fluid that can hold a high amount of dissolved gas has been shown to support the respiration process of humans. It was first experimented to sustain very early term premature born babies or people who have suffered traumatic burns that extended to the lungs. As a form of life support it kinda sucked I think it only saved 40% of a very small limited group of test subjects (who had a high chance of mortality anyways) but it was suggested that if another substance more effective could be found and they could overcome issues like collapsed lungs and infections that the tech could potentially be used for deep sea diving or space travel.
When the baby’s head is out, but the rest of the body is not, the chest is in the birth canal/vagina. Babies need a really big breath to inflate their lungs for the first time, which they can’t achieve when their chest and abdomen are squeezed tight. However some babies do try to cry, but it’s more of a grimace
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