So there are normal developmental milestones that parents need to know about so that they don't think and believe that there's something wrong with their child, and their child is like this awful child who's totally out of control. To understand and sympathize - I think this helps the development of the child to turn out the kind of adult that all of us want our children to become. If we have that idea, if we understand that's normal, that's what toddlers are all about, then we know our long-term job of trying to help them learn appropriate behavior is going to have a lot of ups and downs to it. There are two things that happen. In other words, the whole language acquisition.
Parents now have a child who can talk, and who then can reason - but they expect too much.
And they expect the child to understand what is expected of them, and some of the expectations are totally unrealistic. What this does is get the child angry and frustrated. And then we get into the whole temper tantrum situation that so many parents fear. Now, if you and I have a task and we can't do it, we get frustrated and angry. Now we may not have temper tantrums and hold our breath, etc.