My two boys had bad reactions to mosquito and ant bites when they were little... my youngest sons foot got infected when he was around two years old and stepped in an ant bed while playing in the yard... he almost had to have surgery, but finally after two months and four medications later his poor little swollen foot was back to its old self and able to fit in a shoe again.

My boys (young men) are 24 & 19 now and they no longer have bad reactions to mosquito or ant bites.
But my oldest son is highly allergic to wasp stings... Benadryl is always on hand.