Where is the developing baby housed in?

The developing baby is housed in the uterus, which is the correct answer. The uterus is a muscular organ located in the female pelvis, specifically designed to support the growth and development of a fetus during pregnancy. As the fetus develops, the uterus provides a safe and nurturing environment that is essential for its growth, including the necessary nutrients and protection from external factors.

The other options refer to different aspects of female reproductive anatomy or stages of fetal development. The ovary produces eggs and hormones but is not where the baby develops. The abdomen is a broader anatomical area that contains various organs, including the uterus but cannot specifically provide the nurturing environment for fetal development. The term "fetus" is used to describe the developing baby after the embryonic stage but does not refer to the location where the baby is housed. Therefore, the uterus is the definitive location for the developing baby during pregnancy.