Would-be parents might want to persevere with old-fashioned sex for a little longer before resorting to IVF. One of the most comprehensive studies to date suggests that babies conceived by IVF are more than twice as likely to suffer major birth defects as babies conceived naturally. The controversial findings, which are the first to suggest such a high rate of malformations, come amid concern about the aggressive marketing and growing use of IVF in countries such as the US.
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