Verified cases of human superfetation are rare. While it may be an interesting phenomenon, it isn't one to worry about happening in your pregnancy. https://www.verywellfamily.com/superf... However, most of the verified cases have been with twins that are only 10 days to three weeks apart, and the reported cases were usually safely delivered. Although two foetus develop simultaneously in superfetation, they differ in maturity, having been conceived days or even weeks apart. Superfetation is observed in animal reproduction, but it is exceedingly rare in humans. Only a few cases are documented in medical literature.
https://www.bbc.co.uk/iplayer/episode...
Breakfast
13/02/2021
The latest news, sport, business and weather from the BBC's Breakfast team. Charlie and Naga.
Duration 240 mins First shown 6am 13 Feb 2021 Expires tomorrow 10am