My 8 month old nephew has the most foul breath all the time i have ask my brother and sister in law if they have had this checked br the doctor because it is that bad you dont want to hold him to close they dont seem to fazed they are young parents and just arnt really grasping the parental role at all its lucky they live with myself and my mother or the kid would not be cared for well. They often dont feed him his 3 meals a day instead they just give him a bottle so by the time we have realised they havent fed him my self or my mother will do it but its while after he should have been fed. I was wondering if this could cause a reflux which i know can cause bad breath he doesnt semm to vomit or regurgitate ive checked his mouth for infections or gum prublems but everything is fine he has two teeth through and some more coming but again the are coming through fine