Many parents think that as long as the baby is head-down in the womb, the baby is ready for birth. Head-down is only half the story. It is a big relief to find out the baby is notbreech(buttocks coming through the pelvis before the head is born), especially when so many breech babies are born bycesareanthese days. But being head-down is only the first step. For the best chance at a natural birth:
Baby should have his or her chin tucked.
For a first time mother, the baby begins to engage in the pelvic brim (dip into the pelvis a bit) by38 weeks.
A second baby or more may wait above the brim until labor begins