Unfortunately, my 100% naturally fed baby did develop allergies (peanuts and milk). One theory is that he was exposed to the proteins of those substances in my milk.
Everything is pretty much theoretical at this point when it comes to allergies, however!!!
What has changed? - actually it's more like what has been addded!
Immunizations - with built-in allergies -- the drug mfg's dream come true. Guaranteed consumers!
Trust me on this, I am a certified bio-med tech.