Same here, started with peanut butter and egg for a 4 month old. Now has allergies for both. I guess it works across populations. Or the research is wrong
I have 3 kids 3 and under, no twins. We did a similar thing around 5-6 months. They hate eggs with a passion but no allergies. About to start the peanut butter trials with my 5 month old.
We did the same with shrimp and oysters. My son loves seafood gumbo and made a whole restaurant turn around when he first tried it. He loves it.