What is scientific name for place where baby develops?

Uterus Eggs are first fertilized in the fallopian tubes after sexual intercourse. After approximately 4 days or so the embryo (fertilized egg) travels to the uterus where it attaches to the endometrium, or the lining of the uterus. This is where the baby will stay as it develops over the next 9 months. The baby is not in the abdomen, instead it is the uterus that expands as the baby grows. The endometrium is also what is referred to by some as the "womb".