The way a child behaves is down to parenting style and discipline and its as simple as that!
Sorry to target this one comment but can I just say this really winds me up.
Not for the first time on this thread it is asserted by parents of very young children that "this" is how you raise a well behaved child.
It is rubbish, come back in 15 years and let's see how your child behaves.
My brothers and I were all "badly behaved" in different ways and I can assure you they were not down to my parents' "parenting style" or "discipline".
If we knew how to create perfectly well behaved, well mannered children then we would ALL do it, wouldn't we? There are many influential factors out of a parents' control and I hope to God none of us end up raising a child with behavioural difficulties but the likelihood is that many of us will.
If it was as easy as just setting boundaries and disciplining then the world would be a much better place and parenting would be a hell of a lot easier!