A little whistling in the throat of a baby may be caused by upper respiratory tract infections, laryngeal cartilage underdevelopment, etc. The baby’s throat may be a little whistling in the throat of a baby. 1. Upper respiratory tract infection: because the infant immune system is not well developed, a variety of pathogens can be caused by upper respiratory tract infections, commonly known as “colds”, manifested as fever, nasal congestion, runny nose, coughing up phlegm and other symptoms, when the infant throat phlegm, there can be a whirring phenomenon. 2. Laryngeal cartilage underdevelopment: this disease is due to the infant laryngeal cartilage is soft, inhalation appears to be sunken, so that the laryngeal cavity becomes narrower and produce laryngeal tinnitus, so there will be huffing and puffing sound, can be accompanied by inhalation three concave sign, most of the affected children’s general condition is good. As the child gets older, the laryngeal cartilage gradually develops and the laryngeal tinnitus gradually disappears. There may be other reasons for a little whistling in the throat of infants, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.