Ask your gp to sand him for test and from there you will know what course the breathing problem.and what to take or use, it might be a flu but untill you do the test. not wrong all is well with him. just be postive that all is going to well .
Your baby could have a problem with his/her larynx it's to do with the muscles by your voice box,my daughter has it and when she was little she sounded awful and when I would lay her down it was like she was catching her breath,I didn't sleep for months thinking she was going to die in her sleep,go back to your doctor and discuss this with him.