RESUMEN
This was a pilot study comparing the success between early versus late external cephalic version (ECV) involving primigravidae with singleton breech pregnancy. They were randomised into early (34–36 weeks) and late (37-40 weeks) ECV groups. A total of 44 women were initially randomised into 22 women for each group. The overall ECV success rate was acceptable in both groups although insignificantly higher in the late ECV group (55.6% versus 46.7%, p= 0.732.) Caesarean section in the early ECV group was higher (80% versus 72.2%). Early ECV group had women with higher BMI (29.5 versus 26.8 kg/m2, p=0.107), anterior placentation (60% versus 38.9%) and extended breech presentation (55.6% versus 44.4%; p= 0.296). In conclusion, early ECV in primigravidae showed no better success rate than late ECV. Maternal obesity, anterior placentation and extended breech presentation should alert to failure risk.