When I was a baby (about 2 years old) my mum said I was screaming in a restaurant, and a worker there came up to my mum and politely asked her to leave temporarily until I had calmed down, because other people were trying to eat. My mum understood, as she was getting annoyed with me too, so she took me to the bathroom, got down on to my level and told me to behave myself and eat my meal like a big girl. I said something like "I wanna be big girl" and when we went back I actually sat up the table nicely, and mum kept praising me up. This is good training on small children. I had ADHD (unrecognised then) but my mum still managed to control me to an extent. It's when I got older was when I was harder to control, but by then I wasn't screaming or a nuisance to other people, I just showed my parents up (which wasn't nice for them, I know).