DS is 19 mos and is starting to hit - mostly out of frustration when he doesn't get his way. He's just starting to form words and phrases but I do think part of his hitting is his way of communicating that he doesn't like things or that he's upset. How do you curb this behavior from making it a habit? He doesn't have the concept of time yet but when he is angry and starts to hit we tell him firmly, "No" and if he does it again we put him in a chair until he calms down which can take a few seconds or a few minutes. Sort of like a time out. Any advice out there?