Everything about Superfetation totally explained
Superfetation (also spelt
superfoetation, based on a false
etymology — see
fetus) is the formation of a fetus while another fetus is already present in the
uterus. When there are two separate instances of
fertilisation during the same
cycle, rather than different cycles, it's known as
superfecundation.
Superfetation is claimed to be common in some species of animals, but is extremely rare in humans. It can occur only where there are two uteri, or where the
menstrual cycle continues through
pregnancy.
In animals
Animals which have been claimed to be subject to superfetation include
rodents (
mice and
rats), farm animals (
horses and
sheep),
marsupials and
primates (
monkeys and
humans). Superfetation has also been clearly demonstrated in
poeciliid fish
In humans
Reports of superfetation occurring long after the first impregnation have often been treated with suspicion and some have been clearly discredited. Other explanations have been given (and demonstrated) for different levels of development between twins. Artificially induced superfetation has, however, been demonstrated although only up to a short period after insemination.
In 2007, Ame and Lia Herrity, conceived 3 weeks apart, were born in the United Kingdom to Amelia Spence and George Herrity.
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)
In May 2007, Harriet and Thomas Mullineux, also conceived 3 weeks apart, were born in Benfleet, Essex UK to Charlotte and Matt Mullineux,
(External Link)
Hoaxes
Flavia d'Angelo, an
Italian woman claiming to have become pregnant with triplets three months after initially getting pregnant, caused global media interest in 2001.
(External Link) However, it was later revealed to be a hoax.
(External Link)Further Information
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