system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does the baby breath in the womb?
gpt
They practice the motions for breathing by inhaling and exhaling amniotic fluid. That practice makes sure the body is strong enough to breathe air after birth. Hiccups are also a workout for the diaphragm and happen frequently in utero. All oxygen recieved before birth comes through the umbilical cord, just in case that's what you're asking.