Preterm Labor

Some women have contractions that cause the cervix to thin (efface) and open (dilate) before 37 weeks of pregnancy. This is called preterm labor. A baby born before 37 weeks is considered premature.

Preterm labor can be caused by certain genital tract infections, problems with the placenta (placenta previa or placental abruption), structural problems of the uterus or cervix, or any of a number of pre-existing health conditions (e.g., diabetes, asthma).

If you have signs of labor or feel strong, regular contractions before 37 weeks, call your caregiver right away. If your cervix is effacing or dilating, you may need to take special precautions to prevent premature birth. Your caregiver may recommend that you avoid intercourse, exertion, and stress and get as much rest as possible.