My son will be one next month, his behavior is really bad. He will look at me while doing something…

My son will be one next month, his behavior is really bad. He will look at me while doing something bad and laugh. Ex: he puts his fingers in his mouth making himself throw up. When i say don’t do that he laughs and continues to do so. After 10 tries i give up and he keeps making himself gag. It drives me crazy. Is there anything i can do?