Babies most often hold out on pooping until they're born, they are certainly active urinators in the womb. In fact, your baby's pee activity goes into overdrive between 13 and 16 weeks' gestation, when their kidneys are fully formed.
So what happens to waste then:-
Babies in the womb need assistance getting nutrients, as well as removing waste products. Your placenta is the key to making all these functions happen.
The placenta is made up of cells that are formed in response to pregnancy. It’s eventually connected with the umbilical cord, which is considered your baby’s lifeline, as it’s the way you transfer nutrients and oxygen to them.
Through the placenta, your baby will also deposit waste products that you transfer out of your own body. So, there’s no poop or pee floating around your womb for the entire nine months.
The placenta is delivered after your baby.
Do babies pee in womb?