Our patient was a 6-month-old infant referred to our hospital with the chief complaints of fever, rapid breathing, and poor feeding from three days ago. There was no history of chocking, coryza, or gastrointestinal symptoms.

She was the first child of the family. The mother conceived this girl after six years of infertility by in-vitro fertilization (IVF). She was delivered through cesarean section at 37 weeks of gestation and was hospitalized for nine days due to respiratory distress. There was no specific complaint after discharge from the hospital until the age of five months. The mother mentioned poor weight gain and occasional coughs, which had gradually exacerbated in the last month. The weight upon referral was 5.2 kilograms, which was between 2nd and 5th percentile. Before admission to our hospital, she was referred to a pediatrician’s office, and sweat test was performed and repeated, which revealed borderline results. She had received Creon capsule, montelukast tablet, and fluticasone spray for one month because of suspected cystic fibrosis (CF). She was also receiving levothyroxine because of congenital hypothyroidism.