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

CNN: Almost 13,000 Chinese children sickened by tainted milk

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).

CNN: Is the medical community failing breast-feeding moms?

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.

BBC: Children with allergies 'being let down'