here this is what it says:
"Another fantastic-accomplishment: your little monkey has been peeing into their amniotic sac for a little while now (this is why potty training takes a while) and if you didn’t know, actually swallows it along with the rest of the amniotic fluid. Although the concept is nasty, their urine is sterile and as part of the amniotic fluid base, is replaced several times throughout the day. So if you didn’t know before, now you can tell people, that yes, you drank your own urine—you were still in the womb, but nonetheless you’ve been there."