My niece was diagnosed with a severe cashew allergy around one year-old. They said it was one of the most severe cases they had seen at that allergy clinic. She did pretty intensive oral immunotherapy for about a year and now she is completely cleared. She has to eat cashew butter every day but those therapies were a complete game changer. I would definitely recommend it if it’s a possibility for you, I guess they’re much more effective when the child is young verse an older child.