Raspberry leaf tea is a traditional remedy in Europe. European studies have found that drinking this tea in the months prior to delivery (not before week 30) helps shorten the second stage of labor by helping the uterine muscles to contract more efficiently, so that contractions are more effective.
The tea is also said to reduce the risk of having an assisted delivery, such as emergency cesarean or vacuum.
In addition to this, raspberry leaf tea is believed to help the uterus to contract back to its normal size after the birth, and encourage the flow of breast milk.
As always you should talk to your doctor, before drinking any herbal teas or taking any kind of herbal remedies.