Breech presentation during pregnancy means that the buttocks of the fetus are presenting first at the bottom of the uterus, and the head is in the upper part or fundus of the uterus. The uterus is shaped rather like an upside-down pear, so the baby's head fits in the lower part, with more room at the top for movement of the extremities. As the baby grows, the uterus gets more crowded and it is most common for it to assume the head -down presentation. Generally, the placenta is attached at the side of the uterus, which seems to encourage the head-down presentation, too. There are a number of variations of the breech presentation, determined by the position of the baby's body parts, like arms and legs, in relation to his or her head and trunk. They are -