There are many reasons why your baby may not have engaged yet: the shape of your pelvis may mean that you need the pressure of the contractions to get the baby's head to engage. Very athletic women tend to have babies who engage late because their taut muscles hold the baby in a different position. Second and subsequent babies tend to engage later because the abdominal muscles are very loose, so the baby may move freely without feeling any need to get her head down. A big baby may not descend into the pelvis until the contractions start.
Once the baby is head down and moves into the pelvis there are several positions she may adopt: six of the most common are listed below. The position is determined by where her back and occiput (the back of her head) are lying. The most usual position is LOT. If the baby is breech, the position is determined by how the bottom is lying.
Excerpted from Pregnancy Day by Day.
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