Natural remedies for allergies

Hi,

My 8 month old baby has had a few allergic reactions. So far he has reacted to gold kiwi fruit, cauliflower, some baby wipes and seems to have hay fever (he rubs his nose and screams/growls while doing it, like he is annoyed). Last week we ended up taking him to the dr as he got a rash all over his body and face after eating cauliflower. The dr told us he was too young to have antihistamines and sent us home and told us to come back if it got worse. We are all allergic in my family so I know how fast things can get bad which worries me as we had a bad and scary experience when my brother was 4 years old.

I was just wondering if anyone out there knows of any natural remedies to treat or help prevent/reduce symptoms?

Thanks in advance