1. Health
Send to a Friend via Email
You can opt-out at any time. Please refer to our privacy policy for contact information.

Superfetation

By

Updated June 12, 2014

Pregnant woman touching abdomen sitting chair
sot/Digital Vision/Getty Images
Definition: Term used to describe the formation of a fetus while another fetus is already present in the uterus. It occurs when eggs from two separate menstrual cycles are released, as opposed to normal dizygotic twins where multiple ova are expelled in a single cycle. Although common in animals, it is rare in humans, but can result in a twin or multiple pregnancy where the fetuses display a marked difference in gestational development.
Examples:
In 2009, an Arkansas woman became pregnant with two babies due to superfetation. Ultrasound revealed that Julia Grovenburg was pregnant with two babies conceived about two and a half weeks apart.

©2014 About.com. All rights reserved.