In addition to all the great info others posted : the umbilicus contain large vein and two arteries that feeds the baby’s blood stream through connections to an hepatic portal vein (in the liver) and the heart via the inferior vena cava. After birth, this artery/vein system shrivels and becomes a little “stump” inside your abdomen no longer connected to your blood stream…
Your lungs are only needed to get oxygen from outside your body, to inside your body, where it’s promptly dumped into your blood.
Your digestive track is only needed to break down food and extract the nutrients, where it’s then promptly dumped into your blood.
The mother’s body has already done most of the hard work. Her blood already has all the oxygen and nutrients. The placenta is where the the mother’s blood gives all of that to the babies blood, and then the babies blood travels back to the baby through the umbilical cord.
No air inside. Oxygenated blood and the nutrients needed are already in mothers blood stream so go into growing foetus body, they share a blood stream till birth.
Your brain doesn’t need air, food, water etc, other parts of your body take in what they need and feed the rear of your body through blood. Same as baby… exception don’t expect your brain to fall out in 9 months
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