You could take it as consolation that a recent study showed that young children who lied generally scored higher on intelligene tests. According to the study, young children are not usually advanced enough to the point that they can perceive a reality or perspective outside of their own. What happens to them or what they perceive is what the rest of the world perceives also. Lying shows that they've reached a point of abstract thinking where they understand that their point of view is different than those around them.
That's comforting to some degrees.
DS3 is such a good liar that I am afraid he would have us fooled before long. The fact that he denies what he did doesn�t concern me as much as the things he made up to cover the lie.
For instance, yesterday, I let him use the iPhone to Facetime his uncle while I was taking a shower. Once I got out the shower, DS was playing a game on the phone. I asked him what happened, and he told me his uncle�s phone was out of battery and broke. I could tell from his body language that he was lying, and he later admitted to me that he ended the call himself to play games.
He is also very good at blaming others for what he did. Should I be concerned? Or is it just a developmental phase?