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Dear Cecil:
Excerpt from The Straight Dope
Do unborn babies pee and/or defecate in the womb? –Realtime, via e-mail
Cecil replies:
That’s two questions, so two answers. Number one: yes, and it’s a good thing they do. Number two: yes, but you better hope they don’t.
Fetal urination is normal. It’s part of that “miracle of life” the nature programs exalt just before they hit you with something you’d rather not know. Naturally, fetal urine isn’t quite the same as yours or mine. It does contain urea, but much of the nitrogenous waste enters maternal circulation for mama to clean up. Fetal urine isn’t yellow, either. Fetuses and newborns lack enzymes to convert bile pigments to urobilin, which colors the output of older children and adults…
Click here to read the full article| digg story
Tags: Fetal Development, fetal urine, miracle of life, unborn babies, womb

At first, when I heard that babies pee into amniotic fluid, I was quite surprised. But now, when I read that they swallow it after peeing there, I’m even more surprised. May be this is why they are hiccupping so amusingly - nobody will feel pleasant after swallowing one’s own urine. :)) However, the fact that amniotic fluid regenerates regularly makes its content stable, that’s why there’s nothing to worry about, I think.