Hi - my son has type 1 b. He is 4 so trying to find my feet a little with diet and exercise. This is all very foreign to me....
First off it takes time to master the condition, try not to get stressed with it.
I'll tag
@DCUKMod . Your post may get more relevant input in the parents section. It can be moved there if you wish.
Diet and exercise are very different for young ones like your son, advice from adults wouldn't be necessarily appropriate.
One thing I will say is ..... don't restrict your sons life because of diabetes, use the diabetes to help him eat healthy and find a way to exercise/ play. Eat healthy and exercise/play it's what all 4 year olds should do, but many fail. Use the diabetes to make it his way of life.
Good luck.