4-year-old children sleep at night on a cough in the throat there is phlegm how

Coughing at night may be the cause of respiratory tract infection. Inflammation will stimulate the increase of respiratory tract secretions. You can follow the doctor's advice to use antitussive and expectorant drugs for treatment. You can also feed the child more warm boiled water, or pat the child's back to help dilute and oscillate sputum and try to excrete it from the body.