KHALIS - a young chess nut or chestnut

my youngest child, khalis, could yet turn out to be the best, he has abounding confidence , aspires to be a lawyer/judge.lately he has developed a passionate interest in chess and he has been my chess opponent for the last few months. over time i have notice a marked progress in his tactics/strategy, last sunday was defining, for the first time i saw him in competition and straight away i can see what the weakness in him was, he is too impatient, just right after his opponent moves, he was already moving his piece, this eagerness of course leads to mistakes. the question is what sort of training is there out there that can train him to curb his rashness. maybe the answer is to take part in more competition so that the atmosphere of competition becomes second nature to him.nevertheless, sometime soon i shall beat the bejeebees out of him and thrash him in our next game