Uterine contractions

Postpartum uterine contractions: What are "afterpains"?

In the first days and weeks after the baby is born, many women—especially those who are not first-time mothers—experience periodic cramps in the lower abdomen that feel like menstrual pain. These painful uterine contractions, known as "afterpains," are an important and beneficial part of postpartum recovery. Although they can be quite intense, they indicate that your body is doing its job correctly.

Why does the uterus contract? The involution process

During pregnancy your uterus expands many times its original size. After delivery its main task is to return to its pre‑pregnancy size. This process is called involution. Uterine muscle contractions perform two key functions:

1. Stopping bleeding: At the site where the placenta was attached, a large raw surface with open blood vessels remains. Intense uterine contractions compress these vessels, preventing dangerous postpartum hemorrhage.
2. Reducing size: Rhythmic contractions help the uterus gradually shrink, returning to the pelvic cavity.

Why does the pain increase during breastfeeding?

Many women notice that the cramps become especially strong while nursing. This is linked to the hormone oxytocin. When the baby suckles, your brain releases oxytocin, which not only stimulates milk let‑down but also triggers intense uterine contractions. This is a completely normal and very effective mechanism that nature devised to speed up your recovery.

Why is the pain stronger with each subsequent birth?

Usually first‑time mothers feel these contractions less intensely because the uterine muscles are still in good tone. With each subsequent pregnancy the muscle tone of the uterus decreases slightly, so it has to contract more forcefully to perform the same work, resulting in more noticeable pain.