The short answer? No, while in the womb, a fetus doesn't poop – although it does pee.
However, some waste does accumulate in its lower intestine throughout the pregnancy, which is a result of nutrients received from the mother via the umbilical chord. Called meconium, the fetus does not poop this while in the womb.
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The fetus will excrete this sticky, greenish waste shortly after birth. In rare cases, due to distress during pregnancy, the fetus will release its waste while still in utero – potentially resulting in meconium aspiration syndrome, which can be very dangerous for the baby if it inhales the mix of fluid and poop.
Take a look at MinuteEarth's video explaining more.
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