Читать книгу Double Trouble: Twins and How to Survive Them - Emma Mahony - Страница 16

Superfecundation describes the fertilization of two eggs after two or more bouts of sex during the same menstrual cycle. Given the small window of ovulation and the short lifetime of a sperm, these bouts of sex have to take place quite close together. Very interesting. Could this be you? (unlikely if you have any other children in the house).

Superfecundation gives rise to the possibility of twins with two different fathers, for women who might wave their husbands off to work and then open the back door to the milkman. Rare incidents of mixed-race twins where one baby is born black and the other white can also happen in normal twin conception with the same father, as in the case of the twins Karen and Cheryl Grant from Essex, now 19.