First, a man's sperm mixes with a protective  fluid and it is called semen. Then if the semen does not reach to uterus, no baby is made. But if it does, it finds an egg in the woman's uterus, it multiplies and sticks to the walls of the uterus. This keeps on going for about 1-3 months until a little baby is made in the womb. After nine months, the baby is the size of a watermelon! Then it is ready to be born. Sometimes when the mother cannot push the baby out properly, like when the baby is facing the wrong way, they have to open the belly for the baby to come out. This process is called a C-section. When the baby comes out, the doctor or nurse cut the umbilical cord because the mother does not have to feed the baby through the cord anymore. It can eat through its mouth. Then the space where the umbilical cord was, becomes your belly button. Girls are not the only one who can give birth. Trans and different genitals can too!