A complete breech is a type of fetal presentation during childbirth where the baby is positioned with its buttocks down and its legs folded at the knees, with the feet near the buttocks. This position can complicate delivery, as the baby is not in the typical head-down position that is most favorable for a vaginal birth. In a complete breech, the baby's head is usually at the top of the uterus, while the buttocks are at the cervix. Healthcare providers may recommend options such as a cesarean section for delivery to ensure the safety of both the mother and the baby.