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This is a medical term which refers to the baby's head being unable to pass safely through the mother's pelvis during delivery and birth. This may be because the maternal pelvis is very small, or more unusually because the baby's head isn't aligned and its wider diameters present at the pelvic brim. Unless, for example, a woman knows she has a narrow pelvic outlet and the baby is large, cephalopelvic disproportion won't become apparent until the head fails to engage some time after 36 weeks of pregnancy.