My 4 month old son has a productive cough and is wheezing, is this pneumonia or bronchiolitis again?

Needs examined. Can not be sure unless examined. Call your doctor.
Many possibilities. With these symptoms, your physician will assess further and may order a chest radiograph. If he is wheezing, a nebulized bronchodilator may be used to test whether he will respond to an inhaler. Providing your physician with information about your pregnancy, labor and delivery will be helpful. PRMG/Pediatrics will review records faxed to 858 259 9689.