S.M.
My daughter is 21 months and when she was around that age, she started throwing tantrums. When i put her in her "time-out" chair she would throw her head back and hit it against the wall. I tried moving the chair away from the wall but then she would just tip the chair over backwards. Eventually this stopped and she moved on to other forms of tantrums. She would kick things, and throw things or hit herself. It sounds weird, but when she would start to throw a fit, I'd throw myself down on the floor and start kicking and whining. It really works. It showed her how ridiculous she looked and she realized that she wasn't going to get attention that way. Don't get me wrong, she still throws fits, but not nearly as bad as before.