Ian didn't nap for most of yesterday and towards the evening his poor little arms and legs were stiff and vibrating -we were literally watching him grow. But once he finally went to sleep last night he slept for longer stretches (3 to 3.5 hours) and is enjoying a lazy Saturday morning now. Last night was one of the few times he cried and really it was more of an alarmed squawk every 15 minutes or so. But given the hard time he was having, it's understandable.
We should have measured him yesterday to compare with today.