“…When women die in childbirth, the baby's head is often too large. This problem of 'cephalopelvic disproportion' is a major predictor of serious birth difficulty (Ferguson & Sistrom, 2000), and is fairly common (e.g. affecting 6.9% of nulliparous women in Zaire, such that they require emergency Csections, Liselele, Boulvain, Tshibangu, & Meuris, 2000).…”