Head nod

Over the weekend, little man started nodding his head yes or no to questions.  I first noticed it when I asked if he wanted something to snack on.  He vehemently nodded NO.  Which I thought was really cute.  Then I just started asking him random questions to think if he'd do it again. And he did.  And he started nodding YES. The yes is very deliberate and slow, whereas the no is very quick.  Guess which one he does more?