The main purpose of a stretch and sweep is to reduce the need for a medical induction after the due date, says Dustin Costescu, an obstetrician in Hamilton, Ont. “Because it causes a natural release of chemicals, it is less risky than medications used for induction such as oxytocin or prostaglandin gels,” he explains.

Why do midwives offer a sweep?

To carry out a membrane sweep, your midwife or doctor sweeps their finger around your cervix during an internal examination. This action should separate the membranes of the amniotic sac surrounding your baby from your cervix. This separation releases hormones (prostaglandins), which may start your labour.

How long after a sweep does labour start?

If the membrane sweep is successful you will usually go into labour within 48 hours. Having 2 or even 3 membrane sweeps 48 hours apart is the most successful in encouraging labour to start.