Which structure of the female reproductive system houses a baby as it grows?

• A. Uterus
• B. Vagina
• C. Ovaries
• D. Fallopian tube

Answer: (A)

Where a developing baby grows is in the uterus, a hollow, muscular organ in the pelvis. The uterus houses the fetus in the uterine cavity, lined by the endometrium which thickens to support implantation and pregnancy. As the baby grows, the myometrium—the muscular wall—stretches to accommodate development, while the placenta interfaces with the uterine wall to supply nutrients and remove wastes through the bloodstream. The vagina serves as the birth canal and part of the delivery process, not a growth space for the fetus. The ovaries produce eggs and hormones, but do not contain the developing baby. The fallopian tubes carry eggs from the ovaries and are the typical site of fertilization, not the place where gestation occurs.