Dr. Seifu Demissie practices Pediatric Pulmonology in Saint Petersburg, FL. Dr. Demissie treats children who have breathing problems, or a problem with his or her lungs. Pediatric pulmonologists often treat children with chronic cough, difficulty breathing, recurring pneumonia, asthma, cystic fibrosis, apnea, chronic lung disease in premature infants, noisy breathing, and conditions that require special equipment to monitor and/or help with breathing at home.