Twins with two fathers are possible with heteroparental superfecundation and heteroparental superfetation. Superfecundation and superfetation and two rare events.
- Superfecundation is when there are twins from ovulation on the same day with two separate fathers.
- Superfetation happens if there is a second pregnancy from two separate ovulations; the second ovulation can occur weeks or even months after the first.
Superfecundation or heteroparental superfecundation is the word for twins with separate fathers. Each twin has a separate father. For this to happen, two things have to happen:
- You have to ovulate twice (dizyogtic). This is actually not so rare an probably happens in more than 1 in 50-100 ovulations.
- You have to have sexual intercourse with different men within a couple of days to one week prior to ovulation. That allows two different sperms to fertilize two separate eggs.
Both of these events can happen from having intercourse with separate men on the same day or different days, as sperm can survive for up to 5 days. Multiple ovulations happen in about 1% (or more) of all ovulations, and more often when you take ovulation-inducing medications.
A case of superfecundation was recently reviewed by the New Jersey State Superior Court. It decided that one man is the father of one of the twins and the other the father of the other twin. Each father was responsible to pay child support for each child. Read more HERE....