babe, it's perfeectly NORMAL for babies to hav such sounds. in fact, dear son's one disapear when he was around 6mths old. my pediatrician said it will totally go off around 6-8mths old..
as long as she can breathe well, is okay. to check if she can breathe well, you can see if she can drink milk well without pushing away the bottle to use her mouth to catch a breath. or if she can suck her pacifier =)