Trying to have a baby New formula predicts woman's chance of becoming pregnant
The average 25-year-old woman who has been trying for six months, has a 15 per cent chance of conceiving in the next month

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UPDATED:

11:01 GMT, 5 October 2012

A formula that predicts a woman’s chances of pregnancy has been devised by scientists.

It combines information about how fertility drops with age with the length of time a woman has been trying to start a family, to come up with their odds of conceiving.

For example, they have worked out that the average 25-year-old who has been trying to get pregnant for six months has a 15 per cent chance of doing so in the following month.

What are the odds

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In future, it may be possible to create an online calculator that provides couples with a personalised pregnancy prediction

‘As time goes by and people have been trying for a while, they start to get stressed and upset and that can affect their chances of having sex and then becoming pregnant. Approaching a doctor about a personal matter is daunting, so knowing the right time to start investigations would be a useful step forward.’

Writing in the journal PLoS One, she also warns that taking too long to conceive could indicate that the resulting pregnancy might be risky.

The work could help doctors to decide whether to refer patients for costly and uncomfortable tests or advise them to keep trying for a baby a little longer.

The researchers have passed their work to the National Institute for Health and Clinical Excellence, which formulates health guidelines. In future, it may be possible to create an online calculator that provides couples with a personalised prediction.

Professor Hartshorne added that factors such as smoking or being fat are ‘not the most important things’ when it comes to conceiving. However, a healthy lifestyle will boost the odds of a healthy baby.

She said: ‘If your tubes are blocked, giving up smoking really isn’t going to make a difference, but things like smoking and obesity do have important effects when you do get pregnant and in that respect they should be addressed as soon as possible.’

Scientists have succeeded in turning laboratory-made eggs into baby mice for the first time.

Experts have described the work as ‘incredible’ and point out that the baby mice born as a result of the experiment went on to have litters of their own.

The research at Kyoto University in Japan could eventually allow women left infertile by cancer treatment or by premature menopause to ‘grow’ new eggs.

Dr Allan Pacey, a Sheffield University fertility expert, said the Japanese work, reported in the journal Science, could one day lead to the ‘routine’ production of new eggs.