Fertility treatment is far more likely to result in multiple births than natural conception.

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By the mid-30s, eggs are of poor quality, and chances of natural conception have decreased considerably, and even IVF, the professor said, struggles to make up the shortfall.

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Couples hoping to avoid in vitro fertilization in favor of natural conception at future space hotels are going to be sadly disappointed, says a former NASA flight surgeon.

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During mass, priests across the country stress the importance of every human being's right to life from the moment of conception until natural death.

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Professor Leridon said the study had been carried out because it was important to answer a range of practical questions about the chances of either natural or artificially aided conception so that couples could be given more precise information about the potential risks of postponing childbirth beyond a given age.

BBC: The researchers evaluated women's chances of conceiving