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 www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: 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: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: www.ajog.org/article/S0002-9378(15)02235-8/fulltext www.ucsfhealth.org/education/conception_how_it_works/ www.britannica.com/science/corpus-luteum www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/placenta/art-20044425 kidshealth.org/en/parents/week7.html www.ncbi.nlm.nih.gov/pmc/articles/PMC6046526/ obgyn.onlinelibrary.wiley.com/doi/pdf/10.1046/j.1469-0705.1999.14030219.x www.tandfonline.com/doi/abs/10.1080/jmf.14.4.217.219 www.mayoclinic.org/tests-procedures/in-vitro-fertilization/about/pac-20384716 www.ncbi.nlm.nih.gov/pubmed/16126061 www.healthline.com/health/superfetation#known-cases www.ncbi.nlm.nih.gov/pmc/articles/PMC3551800/ www.ncbi.nlm.nih.gov/pmc/articles/PMC1626817/ www.ncbi.nlm.nih.gov/pubmed/23043772 insights.ovid.com/pubmed?pmid=18978637 www.ncbi.nlm.nih.gov/pubmed/1031544 openaccesspub.org/jfb/article/216 www.publish.csiro.au/rd/rd12238 Image Sources: commons.wikimedia.org/wiki/File:Human_Fertilization.png commons.wikimedia.org/wiki/File:Progesterone.svg commons.wikimedia.org/wiki/File:Scheme_female_reproductive_system-en.svg commons.wikimedia.org/wiki/Fi le:Identical-fraternal-sperm-egg.svg commons.wikimedia.org/wiki/File:Uterus_didelphys_0001.jpg

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