"Over 70 different tests are routinely conducted in the course of producing infant formula and other milk products, " Nestle said.

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The family said she strangled the boy, Kayed bin Nayef bin Jazyan al-Otaibi, after being asked to bottle-feed him, but Nafeek said the infant accidentally choked on milk.

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Nafeek said the infant accidentally choked on milk.

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The limit for milk, baby food and infant formula is 50 becquerels per kilogram.

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Many teaching in medical schools today were raised in the better-living-though-chemistry age, when infant formula was thought to trump the attributes of breast milk. (Formula was certainly an improvement over the non-pasteurized cow's milk that killed many infants at the turn of the 20th century, when breast-feeding was not in vogue).

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Heather Payne, of the Infant and Dietetic Food Association, said only a small percentage of UK mothers used soya milk.

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For some infants, a milk allergy can't be missed - as soon as the baby has infant formula he develops hives and swelling, but for others the reaction is delayed and causes chronic symptoms.

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