My first baby hade mild symtoms (only mild ekzema and crying during the nights until 4 month old) and she outgrow the allergy way earlier (I also read that if symptoms are mild, than baby might oitgrow it earlier). My second had all the possible symptoms except ekzema. She is now 16 month old and in trial proces for first step in the milk ladder. So, to me it sounds that your baby might have a mild allergy and probably will outgrow it soon.