ok another thing my ds who's just a little shy of 5 months old has been doing a lot of recently is make a quiet groaning noise. it used to be his tired cue, but now he does it almost all the time now... when he's sleepy, feeding, playing with a toy, biting down on something. is he just liking the sound of it?? he coos, squeals, and laughs too....but i'm just anxious to hear him make some new sounds. there was a time when he was 3 months old and was doing a lot more baby talk with varying sounds, but it stopped. anyone else exprience this?