okay, i've noticed for the past few weeks that my 3 week old (almost 4 weeks monday!) kind of makes a "growling" noise off and on when he's resting. it sounds almost like he's snoring, but his eyes are often open, unless he's sleeping with his eyes open? it seems to be most noticeable after a feeding. has anyone else had this happen? is this normal? it almost sounds like he has mucus in his throat that needs to be coughed up (like happens to some people when they drink fatty milk). it doesn't seem to be getting any worse.... any thoughts, comments, similar experiences? thanks!