My budgie was attacked by older ones as a baby now his cere is gone. He lives well nowadays and has a wife and a son but still he has some breathing problems so i was wondering will it grow back naturally? Can i do anything to help him breath better?
How old is he now? As it sounds like it was a while ago and no regrowth has occurred as yet, I would be doubtful. I think your breathing question needs to be taken to a vet for any sort of considered opinion.
We are not Vets, Avian or otherwise. If you have any serious doubts about your budgies' health an appointment with an Avian vet should always be your first point of call.