A study by researchers at the University of Aberdeen seems to suggest that frozen embryos, when they result in pregnancy, create healthier pregnancies for mother and child than non-frozen ones.

Dr Abha Maheshwari, senior lecturer in reproductive medicine, said the findings are very interesting as there has always been a feeling that "fresh is the best".

"The data is coming that fresh and frozen are equal," she told the Today programme.

Dr Allan Pacey, chair of the British Fertility Society, believes the findings provide "an element of reassurance".

"We've always been a bit nervous about frozen embryos and whether the outcomes were the same," he explained to presenter John Humphrys.

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