Unsourced material may be challenged and removed. Thus, the fertile period can span five to seven days. This is known as superfetation. In , a case of spontaneous monopaternal superfecundation was reported after a woman undergoing IVF treatments gave birth to quintuplets after only two embryos were implanted. Superfecundation, while rare, can occur through either a complex single occurrence of sexual intercourse, separate occurrences of sexual intercourse, or through artificial insemination. Once ovulation occurs, the egg remains viable for 12—48 hours before it begins to disintegrate. This led to the discovery that the twins had different fathers. Superfecundation most commonly happens within hours or days of the first instance of fertilization with ova released during the same cycle.
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