Canadian researchers have investigated the effectiveness of acupuncture for assisting in the initiation and duration of labour.
Sixteen pregnant women at full term, were randomly assigned to receive acupuncture either at sites traditionally used to bring on labour, or at nearby sham sites. The results showed that women in the true acupuncture group on average went into labour 62 hours ahead of the sham group, and also experienced labours which were on average two hours and twenty minutes shorter.
(Effectiveness of Acupuncture for the Initiation of Labour at Term: A Pilot Randomised Controlled Trial. Journal of Obstetrics & Gynaecology of Canada Dec 2008)