A baby's digestive system starts to develop before you might even know you're pregnant. While their first bowel movement isn't until after they're born, babies do pee in the womb and build up waste ...
Meconium is a thick substance that lines a baby’s intestines in the womb. A baby usually passes meconium after birth, but if they pass it early, the amniotic fluid may become meconium-stained.
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