In pregnancy, lightening pops up if the fetuss head moves toward the pelvis to prepare for birth.
Thisthird-trimestershift is often called “dropping,” due to the lower position in a pregnant person’s abdomen.
This article explains lightening and what it feels like.
Larry Williams / Getty Images
Larry Williams / Getty Images
What Is Lightening?
Lightening takes place if the fetuss head moves deeper into the pelvis to prepare for birth.
Lightening can happen from a few weeks to a few hours before labor begins.
During a first pregnancy, dropping usually happens two to four weeks before delivery.
In people whove been pregnant before, lightening may occur right when labor begins.
You may see the change in the mirror.
At the same time, it can cause new symptoms like frequent urination.
Lightening and Fetal Station
Sometimes, lightening is called “engaged” position.
Healthcare providers use this description because the fetus is now in contact with the pelvis in preparation for birth.
Engagement is part of an overall assessment of position called fetal station.
The fetus is “engaged” when the largest part of the head enters the pelvis.
You also may want to tell your OB-GYN if you are experiencing ahigh-risk pregnancyor have a scheduled delivery.
Seeking Emergency Care in Pregnancy
Lightening is not cause for concern.
The fetus is changing position to facilitate entry into the birth canal.
While lightening is a normal occurrence during pregnancy, each pregnancy is different.
Johns Hopkins Medicine.The Third Trimester.
American College of Obstetricians and Gynecologists.How to tell when labor begins.
University of Michigan Health.Pregnancy: dropping (lightening).
Vazquez JC.Heartburn in pregnancy.BMJ Clin Evid.
2015 Sep 8;2015:1411.
University of Michigan Health.Contractions during pregnancy: what to expect.
American College of Obstetricians and Gynecologists.What are the symptoms of labor?
MedlinePlus.Your baby in the birth canal.
Cohen WR, Friedman EA.Clinical evaluation of labor: an evidence- and experience-based approach.J Perinat Med.
2020 Oct 19;49(3):241-253. doi:10.1515/jpm-2020-0256.
Northwestern Medicine.Staying Comfortable in the Third Trimester.