Hi Renson, I dont know if this is the same thing but my step nephew was diagnosed with a floppy voicebox. When he inhaled it made a rattling ( maybe choking kind of noise although once you knew what it was, it wasnt disturbing)
Mind you, this would be about 20yrs ago now. I was only 13 when he was born.
He did grow out of by the time he was about 2. It never bothered him, infact it used to bother us when he didnt rattle. We got so used to it, that if he missed a couple of "rattles" while sleeping we would wake up and go check if he was still breathing LOL.
Was kind of like a built in baby monitor
Oh I just remembered, it did continue until he was about 4 but only when he got upset or really tired and it would come back for a tiny bit.
Unfortunatly my step bro and his wife split up 15 yrs ago and I havent seen my nephew since he was 5.
But as far as I know, it dissapeared completly. HTH, Shell