I don't think you should be overly concerned. More then likely he is going to sleep right through them. My kids never had a problem with fireworks at this age. My DD was fine until she was about 3 and then was scared until last summer when she was about 51/2. She never saw fireworks at D when she was 4, but went to them all this time (just got back, had a great time) and loved them. I guess I would base it on whether loud noises bother him. You could try those squishy plugs that you fit around the opening of the ear, but at his age he will probably not like it and just pull them out. The hard thing is there is no way of knowing really until you try it. Good luck!