Jay, CPD stands for cephlo-pelvic disproportion, which means that the baby's head (cephlo) is "too big" for the mother's pelvis. It is a very rare condition and many believe that it only truly occurs in 2% of first time mothers (more pregnancies tend to make the pelvic joints looser - that they remember to open, and open more easily). It is one of the controversies in childbirth. Felicia Henry, AAHCC & LLLL