Mine does - most days.
They tell me at nursery that he has been "Brilliant, smiley all day" and then when he gets home he does nothing but whinge. (He's 16 mths).
Am wondering if he's just tired, or maybe even missing his little pals? Or just plain pissed off to see me???!
I am concernded cos apart from these days he usually a happy, smiley little chap.