Most inductions of labour are performed after the 41st week of pregnancy because research suggests that after this time the placenta gradually becomes less efficient. There are sometimes reasons for an induction of labour before this time, and this would be a recommended by an obstetrician.

Methods of induction are:
. Vaginal pessaries which contain prostaglandins (hormones) to ripen (soften) the cervix.
. Artificial rupture of membranes (breaking the waters). If the cervix is slightly open it may be possible to break the bag of waters in front of the baby's head by using a long hooked instrument. This may stimulate the onset of labour.
. Syntocinon drip. This is an intravenous infusion which contains a synthetic hormone which makes the uterus contract.
Sometimes more than one treatment may be required before labour starts. Labour may not start on the first day of treatment, and it could be 2 -3 days before the baby is born.