About Red Leaf Raspberry Tea It is often recommended during pregnancy because it is said to help strengthen the uterus, and to help produce stronger contractions in labor. Some health care professionals may recommend five weeks for it to help soften the cervix. When to start Red Leaf Rasberry Tea Thirty-nine weeks is the March of Dime's new definition for full-term in pregnancy. Some fertility literature recommends starting the tea at thirty-two weeks, but not before to allow it time to build in the body. One mom on a message board said she was advised by her midwife not to start it until after 36 weeks because it can cause uterine contractions and can cause you to go into labor early or miscarriage. What Brand To Use My midwife actually recommends buying it loose leaf. She said our natural grocery sells it, so you can buy as little or as much as you want / need and cheaper than buying it already boxed. Tea or Supplement? My midwife recommends the te...