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Even with this sophisticated technology, then, there is still a sizeable margin of error, and a risk of having the "wrong" sex of baby. Once fertilisation of the egg with the sperm has taken place in the laboratory, doctors can distinguish male and female embryos and replace only ones of the required sex in the womb.

Assuming the procedure results in the birth of a live baby, this is the only technique with a 100 per cent guarantee of success.

Aristotle suggested that the ardour of the man at the moment of insemination determined the sex of the resulting infant.A second method, used at the Genetics and IVF Institute in Fairfax, Virginia, US, had more to commend it.This involved sorting sperm by laser, after staining them with a fluorescent dye, which enabled differences in the quantity of DNA carried by X and Y sperm to be detected."We were able to confirm the old wives' tale that eating bananas, and so having a high potassium intake, was associated with having a boy," said Fiona Matthews, who led the study of 740 first-time mothers published in the strangely-named journal Proceedings of the Royal Society B.But, she added, the source of extra calories was less important than the total amount consumed. In the study, 56 per cent of women with a high-calorie intake had boys compared with 45 per cent with a low calorie intake.

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