The baby’s throat always make a roaring sound may be a normal physiological situation, may also be congenital laryngeal cartilage dysplasia, upper respiratory tract infections and so on. 1. Normal physiological situation: the baby’s throat always sends out a roaring sound may be a normal physiological situation, caused by the baby’s own physiological characteristics, with age will gradually disappear. 2. Congenital laryngeal cartilage dysplasia: often manifested as the baby’s breathing is still normal at birth, but 1~2 months after birth gradually appear roaring, can be persistent or intermittent, sometimes may be related to the position, supine aggravated, prone or side-lying when alleviated. 3. Upper respiratory tract infections: Upper respiratory tract infections are very common in children, caused by pathogenic bacterial infections, in addition to the roaring sound from the throat, there will be sneezing, runny nose and other symptoms. The exact cause of this symptom should be clearly diagnosed after examination by a specialist.