My 3 year old son has a bad smell coming from his nose, I thought It was his breath but I ve brused his teeth and tonge and got some childrens mouth wash and still the smell is terrible, it is so bad that you can smell it as soon as you walk in the room. I finally figured out it was coming from his nose and he has had a cold and so I m not sure what the problem is but I feel terrible for him..
Kindly check for sinusitis or atrophic rhinitis. There can also be any foreign body in the nasal cavity. Kindly consult ENT doctor for it.