Superfetation: When You Get Pregnant... Even Though You're Already Pregnant

The process of human baby making seems pretty straightforward: egg+sperm+time=baby. But hold on to your ovaries, folks! It’s pretty rare, but sometimes, days or weeks after a person gets pregnant, they can get pregnant again in a process called superfetation.

Hosted by: Olivia Gordon

SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org
----------
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
----------
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:

Eric Jensen, Matt Curls, Sam Buck, Christopher R Boucher, Avi Yashchin, Adam Brainard, Greg, Alex Hackman, Sam Lutfi, D.A. Noe, Piya Shedden, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters
----------
Looking for SciShow elsewhere on the internet?
Facebook: http://www.facebook.com/scishow
Twitter: http://www.twitter.com/scishow
Tumblr: http://scishow.tumblr.com
Instagram: http://instagram.com/thescishow
----------
Sources:
https://www.ajog.org/article/S0002-9378(15)02235-8/fulltext
https://www.ucsfhealth.org/education/conception_how_it_works/
https://www.britannica.com/science/corpus-luteum
https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/placenta/art-20044425
https://kidshealth.org/en/parents/week7.html
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6046526/
https://obgyn.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1469-0705.1999.14030219.x
https://www.tandfonline.com/doi/abs/10.1080/jmf.14.4.217.219
https://www.mayoclinic.org/tests-procedures/in-vitro-fertilization/about/pac-20384716
https://www.ncbi.nlm.nih.gov/pubmed/16126061
https://www.healthline.com/health/superfetation#known-cases
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3551800/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1626817/
https://www.ncbi.nlm.nih.gov/pubmed/23043772
https://insights.ovid.com/pubmed?pmid=18978637
https://www.ncbi.nlm.nih.gov/pubmed/1031544
https://openaccesspub.org/jfb/article/216
http://www.publish.csiro.au/rd/rd12238

Image Sources:
https://commons.wikimedia.org/wiki/File:Human_Fertilization.png
https://commons.wikimedia.org/wiki/File:Progesterone.svg
https://commons.wikimedia.org/wiki/File:Scheme_female_reproductive_system-en.svg
https://commons.wikimedia.org/wiki/Fi le:Identical-fraternal-sperm-egg.svg
https://commons.wikimedia.org/wiki/File:Uterus_didelphys_0001.jpg