Men can’t have children because men don’t have a uterus. The uterus is a uniquely female organ and is one of the most important organs associated with fertility. After the union of sperm and egg the fertilized egg needs to be deposited inside the uterus and the fertilized egg needs to gradually develop into an embryo inside the uterus before it is conceived as a fetus. The uterus is an elastic organ, about 7 to 8 centimeters long and 4 to 5 centimeters wide, with a capacity of about 5 milliliters, the weight of an egg. However, it gradually increases in size during pregnancy with the formation of the fetus, placenta and amniotic fluid, and when the fetus is about to be delivered, the uterus can contain up to 5,500 milliliters. In summary, the uterus is an essential organ for pregnancy and child birth, and a man cannot have a child without a uterus.