I finally found the 2 references I was looking for regarding allergic reaction to hydrolyzed protein in formula. Saylor, John and Sami L. Bahana "Anaphylaxis to Casein Hydrolysate Formula". Journal of Pediatrics. 1991. vol 118: 71-74. Ellis, Mark, et al. "Anaphylaxis after ingeestion of a recentyly introduced hydrolyzed whey protein formula". Journal of Pediatrics. 1991. vol 118:74-77. Martha Brower RD LD IBCLC Queen of unfiled articles piled to the sky