Lightening

Definition

Lightening is the process during late pregnancy when the baby's head descends into the mother's pelvis in preparation for birth. This event usually occurs a few weeks before labor begins and can result in easier breathing but more pressure on the bladder.

Related terms

Labor: The process by which contractions of the uterus lead to birth, involving dilation of the cervix and ending with delivery of the baby and placenta.

Braxton Hicks contractions: Irregular pre-labor contractions of the uterus that are non-rhythmic and do not result in childbirth, often referred to as "false labor."

Cervical dilation: The gradual opening of the cervix measured in centimeters from 0 (no dilation) to 10 (fully dilated), necessary for vaginal delivery