@CautiousLurker01 when I worked in nurseries, there was a strong focus on not ‘othering’ the children with allergies.
We weren’t allowed to sit them on a table together or provide them with anything other than a placemat at mealtimes (which all children needed to have) with the allergies written and then covered with their plate.
We couldn’t have the allergies listed in a prominent place as it would breach confidentiality.
At one point we had children with allergies to:
Egg
Dairy
Egg, dairy, sesame, soya, citrus
Tomatoes
All in the same room and all under 2 years, but toddling round and wanting whatever their peers were eating.
It was a nightmare, particularly as lunchtime was when we’d have temp staff, or staff from other rooms who didn’t know the children covering for staff on break.
We did occasionally have a child eat or drink something they shouldn’t, but we always told the parents and it was never serious, luckily.
If my child had a serious allergy, there’s no way I’d send them to a nursery.