Funny you should say that as my eldest DD who is 35 grew into coeliac's about 3 years ago and never had a problem before then.Hopefully Sophie will grow out of her dairy allergy and yes maybe the immune system matures in early childhood. It's scary when they have to be rushed to hospital when the swelling starts. Very fortunate to have epi pens nowadays. I honestly don't remember anyone having food allergies when I was growing up. They seem to be much more prevalent these days.