Week 29: To pee or not to pee...Fetal development in pregnancy week 29: fetus in seventh month If you’ve been feeling butterflies moving around in your belly, it’s not just your run-of-the-mill pre-birth performance anxiety. No, it’s your amazing baby with a case of the hiccups: a fairly common occurrence at this point resulting from practicing breathing for their big birthday. In addition, to getting a round of butterfly-like hiccups, your little swimmer has arduously managed to accumulate enough baby fat to account for nearly 3.5% of their overall body weight. Yeah, compared to we adults, it’s not a lot, but when they’re little like that—it’s certainly a healthy (and warming) accomplishment in its way. Another fantastic accomplishment: your baby's spleen is now in charge of hematopoiesis—the 10 dollar name for the process involved in building up certain important blood components. 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.