My dd started making the chest rattle noise around 1 month. I mentioned this to her ped at every appointment starting at 1 month and he told me it was "normal" and that "if she was a dirty old man she would clear her throat and spit in a cup" Yeah he really said this to us on three occasions! Anyway, I was not buying it. It was an awful noise and I wanted a real answer. So after bringing her in a few more times (extra appointments
) and getting this noise caught on tape he said that he thought it was Tracheomalacia (floppy trachea) and that he did not feel that it was serious enough to see a specialist but I insisted. So we saw the specialist and he said he thought that it was Laryngomalacia (floppy larynx) and that she should outgrow it by 1 year. There is no way to know for sure unless they do a scope but since my dd is growing normally and eating normally it is not necessary at this time.
So my advice to you is to get this noise on tape and take it to your ped and let him/her listen to it. If you are not satisfied with the answer you recieve get a 2nd and even 3rd opinion. I might be nothing but if your baby has one of these conditions they need to evaulate the severity of it. Even though there is nothing they can do for the condition if it is mild (it just takes time) it gave me peace of mind to know that there was nothing seriously wrong with my baby!!
I wanted to add that Elle is congested all of the time and she snores all night long. These things are not due to the laryngomalacia. For her nose we use "little noses" saline and a bulb syringe and we sleep with a cool mist humidifier.