as for the sound, does it sounds like 'phelgm' and snoring?? it is normal too.. all babies tend to hav such sounds until they reach 6-8mths old.. i used to thought dear son got lotsa phelgm or his breathing got some pro, kept asked pediatrician, he kept told us is normal and true enough it slowly goes off after dear son reach 5-6mth+..
does any of these 'problem' affect your baby's feeding?? that's the most impt qns you must ask yourself. if not, everything should be alright but if your ans is yes, bring her to a pediatrician now! =)
hope my reply hopes =)