If you IDS has never seen X and X is unlike anything it has seen, it will probably flag it.
> There had been long-standing advice to avoid foods that can trigger allergies during early childhood. At one point, families were once told to avoid peanut until their child was three years old.
This advice was never based on science.
Cultures where infants are fed on the same broad spectrum of foods that adults eat have MUCH lower incidence of allergies. France and Israel to name two.
Datapoint of 1, I started giving my own child chewed up food I was eating at about 2.5 months. She was eyeballing some chicken I was eating, I popped it out of my mouth, offered it to her and she ravenously devoured it.
A couple weeks later, I wiped a small amount of peanut butter on her lip and checked for any allergic reaction, then proceeded to slowly ramp the amount the next day.
Same thing with shellfish. I am not suggesting anyone else do this, but it worked for us.
Train how you live as soon as possible.