what is a best natural home remedies to treat infants with bad asthma?

My godson is 3 months old who been. Coughing really bad and wizzing and some time his cough sound like he Shocking is their any natural way to help him breathe better? And ease his cough?

Make sure its not an allergic reaction. If you have dogs and cats get them out of the house to see if that helps. If you smoke in the house, stop.