My son gets bitten a lot - me not so much - my wife a lot - our other son like me - not so much.
On the bites - we put a little 'mud' pack on them made out of IF#2 and water. Leave it on like 15 minutes to dry. Itch and sting gone from my little ones. It pulls the toxin out of the sting. Stops the itching fast. Also tried it once on our son when he got into fire ants - worked great too. Just got to get it on quick!
A small amount of 'mud' does the trick about the size of a nickle on each bite.