CMPA peaks in the first year of life, occurring in up to 3% of infants.
It falls to less than 1% in children 6 years of age and older.
Source: Koletzko S et al. Diagnostic approach and management of cow's-milk protein allergy in infants and children: ESPGHAN GI Committee practical guidelines. J Pediatr Gastroenterol Nutr. 2012;55(2):221-9.