No, this was done from fear. My generation were given peanut butter early, and it was tested in a small amount to see if there was a problem first. This was common sense for a long long time, and it seemed to work fine.

A generation later parents were told to avoid it until age 3 or 4 for no real reason, and it created a ton of peanut allergies in those kids. They were scared of their kid having a peanut allergy. This was fear, counter to the common sense they themselves were raised with.