A pregnancy that has progressed without any apparent hitch can still give way to complications during delivery. Here are some of the most common concerns. Presentation refers to the position the fetus takes as your body prepares for delivery, and it could be either vertex (head down) or breech (buttocks down). In the weeks before your due date, the fetus usually drops lower in the uterus. Ideally for labor, the baby is positioned head-down, facing the mother's back, with its chin tucked to its chest and the back of the head ready to enter the pelvis. That way, the smallest possible part of the baby's head leads the way through the cervix and into the birth canal.

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