my baby is three nad a half months old. he had been sleeping fairly regularly till now but for the past few days he cries in his sleep or that is how it looks like and then when I pick him up and move around for a while he goes back to sleep.is he facing any discomfort? I am unable to understand. he does this during his afternoon naps and his night naps.wakes up almost every hour or half or so.pls suggest.