He could be uncomfortable for any reason, he could be cold, gassy, just adjusting to being on the outside of the womb. It probably has nothing to do with the circumcision as long as nothings irritating it directly. My son was never affected by his, but man did gas the first few days make him uncomfortable.

I did it with my first and will do with my second , just keep applying the Vaseline with every changing, hell get use to it rn hes gonna be in abit of pain tbh but not much you can do but comfort him😌