[watwut]

All the kids I know pick huge amount of behaviours the way I described. Not all of it, not complicated stuff, but definitely a lot. They also tend to like what other kids like - without them trying to imitate interest as strategy. It just happen naturally.

Especially things like smiling or crying to get something (depending on circumstances) etc - they do it before they have logic and before they have ability to plan. Two years old has tendency to do stuff adults around find cute and react to, but it is not conscious plan. Autistic kid won't or will to lesser extend.