In fact, there is growing evidence that early introduction of allergenic foods has a protective
effect against food allergies and that delaying the introduction of them could increase the risk of food allergies (beyond 10 months for eggs was the only specific age I could find).
Probiotics also decrease the prevalence of
allergies in susceptible individuals, inhibit the inflammatory responses in the gut, and have antagonistic
effects against intestinal and
food - borne pathogens.