A physiological process in pregnancy involving regular, coordinated contractions of the uterus and progressive changes in the cervix. It normally results in the birth of the fetus (or fetuses) and delivery of the placenta.
Labor usually begins with regular contractions that gradually become stronger, longer, and closer together. These contractions thin and open (dilate) the cervix, allowing the baby to move through the birth canal.
Labor is commonly divided into three stages:
- First stage: Cervical dilation
- Second stage: Birth of the baby
- Third stage: Delivery of the placenta
Every labor is unique. Some progress quickly, while others take many hours.
QUICK FACT
Uterine contractions alone do not define successful labor; effective labor involves progressive changes in the cervix and ultimately birth.
COMMONLY CONFUSED WITH
- Childbirth: the broader process of giving birth, which includes labor and delivery.
- Braxton Hicks contractions: irregular uterine contractions that do not normally produce progressive cervical dilation.
SEE ALSO
