A.W.
My 6 year old son is a sweater too. I always keep his hair very short for this reason. His is also big for his age. His doctor mentioned at age 4 that these two combos could be a sign of an over active thyroid. We had him tested and he is fine. So his sweating is normal. Your sons sweating is probably normal too, but you might want to bring up the thyroid possibility to his doc and have him tested.