So you people wanted my references.
According to the Pediatric Nutrition Handbook 4th edition 1998
by the AAP Committee on Nutrtion , 85 % of cow's milk
allergic children outgrow their reactivity by their third birthday. It
goes on the talk of hypoallergenic feeding until the first birthday
then a rechallenge in a controlled setting.
Studies sited are those of Bock SA and Sampson HA
-Rob