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October 12, 2008 4:11:15 AM CDT

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Frozen Embryos Make Bigger Babies

Posted Jul 9, 08 1:57 PM CDT in Technology,  Science & Health 

(Newser) – When it comes to in vitro fertilization, frozen might be better than fresh, a new study shows. Infants born after being implanted in mothers' wombs as frozen embryos were no more likely than those from fresh stock to be born with congenital defects, the BBC reports; but they were also significantly heavier, and less likely to be born prematurely.

 “We think the reason for the differences is probably positive selection of the embryos for frozen embryo replacement,” the study’s lead researcher said. “Only the very top quality embryos survive the freezing and thawing process.”

Source BBC

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    Feb 19, 08 12:01 PM CST
    And Baby Makes ... Too Many? Fertility doctors are beginning to wonder whether they're too successful. With in vitro fertilization prompting a 70% increase in the rate of multiple births since 1980, some are espousing a switch to single-embryo transfer. The procedure lowers the success rate but also lowers the rate of multiple births, with their attendant health risks, the New York Times reports. More »

A microscopic view of an embryo, surrounded by sperm.   (KRT Photos)
A child born with the help of IVF.   (AP Photo)
A scientific researcher handles frozen embryonic stem cells.   (Getty Images)
A vat of liquid nitrogen used in the freezing process.   (KRT Photos)
Frozen embryos.   (KRT Photos)
A doctor checks a cannister of frozen embryos.   (KRT Photos)
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pregnancy  • scientific study  • Denmark  • infant  • embryo  • in vitro fertilization  • human embryos


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