Cephalopelvic disproportion (CPD) exists when the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal.
Diagnosis of CPD usually occurs during labor, often requiring medical interventions such as a cesarean section (C-section) to ensure the safety of both mother and baby.
A large fetus can be caused by gestational diabetes, postterm pregnancy, genetic factors, and multiparity.
A Cochrane review in 2017 found that there was too little evidence to show whether pelvimetry is beneficial and safe when the baby is in cephalic presentation.
[5] It considered routine performance of pelvimetry to be a waste of time, a potential liability, and an unnecessary discomfort.
[5] In the case of a fetus being too large, some obstetricians recommend induction of labour for earlier delivery.