Babies feel hoarse after waking up from sleep, usually the environment is too dry, allergic pharyngitis, acute laryngitis and other causes. 1. The environment is too dry: If the indoor environment is too dry, and the baby drinks less water, it is easy to cause the baby’s organism to lack of water, resulting in the baby woke up with a dry, hoarse voice. You can improve your baby’s hoarse voice by feeding them water or placing a humidifier. 2. Allergic pharyngitis: If the baby ate allergic food before going to bed, or inhaled allergens, it is easy to induce a perverse reaction in the throat, resulting in damage to the mucous membrane of the pharynx, resulting in itchy throat, dry cough and other uncomfortable symptoms, which in turn caused the performance of the hoarse voice after waking up. 3. Acute laryngitis: Due to the low resistance of children, the throat is easily infected by bacteria and other pathogens, resulting in the onset of acute laryngitis. Most of the acute laryngitis will cause some stimulation of the vocal cords, which in turn will cause the performance of hoarse voice after waking up. In conclusion, if a baby wakes up with a hoarse voice and other symptoms, it is recommended to consult a doctor for a clear diagnosis and symptomatic treatment.