It is thought that the babies that were naturally conceived became identical twins, derived from a fertilised egg that split before implantation, although this could have happened to one of the IVF embryos. Dr Amin Milki of Stanford University, who was involved in the treatment of the woman, said that even if this were true, 'at least one fetus would have been conceived spontaneously'.
Dr Milki also said that to prevent multiple births of this type, IVF patients should be advised against unprotected sex during their treatment, especially at the early stages of ovarian stimulation.
Sources and References
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Sex warning for IVF couples
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Women undergoing IVF are warned about sex
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