I start them early too. I've had one yr olds who would scream all day and redirecting them wouldn't work. So I would sit them on my mat (which is large) and they did learn that if they wanted to scream nonstop they got to sit there till they stopped. Yes its early but I don't put kids in high chairs or play pens when they are out of control. I don't want children to associate high chairs and playpens for things they did wrong. They are used for eating and sleeping. I've always done this with my own kids when they were little and it has worked great. Kids do learn quickly, it just has to be consistant.