I am so the same way with my nephew. "Don't play with that, be careful on the stairs, we're in the parking lot so watch out, don't do that because you might hurt yourself, be careful with that, watch out." I constantly have to remind myself to chill out unless it's something big. I do not need to remind him to be careful before he's even done anything that requires me to tell him to be careful. I get so paranoid that he'll get hurt that I tend not to let him get even close and then it's very smothering. I really need to chill.