What stops babies/mammals fetus’s lungs from filling with Embiotic fluid while in the womb?

Question

Additionally, what triggers a baby, once exiting the womb, from taking its first breath?

In: Biology

Answer 1

My second child was born via c section and ended up needing a stay in the NICU because of this. When babies are delivered vaginally, the pressure from passing through the birth canal can help squeeze some of the fluid out of the lungs, but c section babies don’t have that benefit. My child ended up developing pneumonia because too much fluid remained in his lungs after birth and he needed a 10-day regimen of antibiotics to cure him.