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Oxytocin

Overview

Oxytocin is a hormone released from the pituitary gland in the brain. During pregnancy, oxytocin causes labour contractions to begin. Oxytocin also is released when a woman's breasts are stimulated by suckling or pumping, causing milk to move from the ducts and out the tiny holes in the nipple (let-down reflex). In the first few days after delivery, oxytocin also causes uterine contractions that help shrink the uterus back to its pre-pregnancy size.

After breastfeeding is established, your body may release oxytocin when you hear a baby cry, think of your baby, or have sexual intercourse. When this occurs, your breasts may leak milk whether or not you are actively breastfeeding or pumping.

Your body may not release oxytocin when you are anxious, embarrassed, or distracted. You may need to breastfeed in a relaxing, quiet, familiar, private place for let-down to occur.

Credits

Current as of: March 1, 2023

Author: Healthwise Staff
Medical Review:
Sarah Marshall MD - Family Medicine
Thomas M. Bailey MD - Family Medicine
Adam Husney MD - Family Medicine
Kathleen Romito MD - Family Medicine
Kirtly Jones MD - Obstetrics and Gynecology