
:
I think the largest issue is that in children who've already demonstrated a tendency towards allergies, they want to avoid sensitizing and creating an allergy to those foods which children are least likely to outgrow (and most likely to be severe as well).
I think the recommendation, for kids with known allergies or a family history of allergies (sibling etc.) is:
No dairy 'til at least 12 months (assuming the allergy isn't to dairy)
No eggs 'til 24 months
No peanuts, treenuts, fish, shellfish 'til 3 years.
Ina is still allergic to eggs, but we waited to try pn/tn/fish/shellfish 'til she was three. And she's fine with all of them.
We have enough allergies in my (extended) family, I'm pretty cautious about the foods we introduce - I would've been without Ina's multiple infant allergies, but I am definitely more so now. My uncle and a first cousin are both ana to bananas; we don't give bananas to the girls 'til they are 12 months.
I think allowing the child time to be able to communicate that a food 'tickles' or 'tingles' or etc. is definitely a good idea. And it takes awhile for a child to develop that verbal ability. Ina acted like eggs were carbonated/fizzy when we gave them to her, which was one of our tip-offs that she was possibly reacting (followed of course by her projectile vomiting a couple hours later, rash, etc.).