superfetation

Artificially induced superfetation has, however, been demonstrated, although only up to a short period after insemination.

Her case might be a rare example of "superfetation," in which a pregnant woman ovulates and winds up with a second pregnancy.

She says that to prove superfetation "without a shadow of a doubt, would have to be something that was done after the babies are born."

The learned gloss, 'Superfetation of is deliberately awkward.

This phenomenon is known as superfetation.

The risk with superfetation is that the second baby is often born prematurely, which can increase its odds of experiencing lung development problems.

There is a feline phenomenon even stranger than superfecundation and that is superfetation.

Grovenburg's obstetrician reported that cases of superfetation "can only be confirmed after delivery by chromosomal and metabolic studies on the baby."

This level of matrotrophy allows Poeciliopsis to carry several broods at different stages of development, a phenomenon known as superfetation.

Reports of superfetation occurring long after the first impregnation have often been treated with suspicion, and some have been clearly discredited.

Her doctor, identified as M. Muyalert, MD, says that superfetation is "an unusual and rare condition, but the possibility is real."

Kuller says obstetrical textbooks mention a handful of reported cases of superfetation, but it's "extremely uncommon" and is biologically "unlikely," although not implausible.

But Muyalert cannot confirm superfetation, stating only that there is a "suspicion of superfetation" in the Grovenburgs' case.

A case of twins with probable superfetation a report of a case of superfetation demonstrated through different paternity of twins.

Among dizygotic twins, in rare cases, the eggs are fertilized at different times with two or more acts of sexual intercourse, either within one menstrual cycle (superfecundation) or, even more rarely, later on in the pregnancy (superfetation).

The Arkansas TV station that interviewed the Grovenburgs posted a statement from Julia Grovenburg's doctor, who confirms that Grovenburg is pregnant with twins and "there appears to be a discordant growth pattern, possibly due to superfetation."

It's possible that the Grovenburgs' second baby wasn't discovered earlier during the pregnancy, notes Kuller, who says he had a patient with a suspected case of superfetation several years ago but no certain cases of superfetation.

Jeffrey Kuller, MD, professor of obstetrics and gynecology at Duke University Medical Center, tells WebMD that based on the media reports he's seen, he's "skeptical" that the Grovenburg pregnancy is a case of superfetation.

The phenomenon of superfetation, where embryos from different menstrual cycles are present in the uterus, results in hares and rabbits being able to give birth seemingly without having been impregnated, which resulted in them being seen as symbols of virginity .