Newborn babies with phlegm in the throat, consider two causes 1, physiological changes: congenital underdevelopment of laryngeal cartilage, light children in crying and breastfeeding, laryngeal sounds in the throat, similar to the phlegm sound of grunting, serious quiet state can also hear laryngeal sounds, similar to the sound of phlegm, is due to congenital underdevelopment of laryngeal cartilage, laryngeal cartilage softening, generally as the baby gradually grows up can be self Regular supplementation of vitamin D to promote calcium absorption is sufficient, basically six months later can be relieved, is a self-limiting disease. 2, respiratory tract infection: newborns even with bronchitis pneumonia, clinical manifestations may not be very typical, there can be no fever, only a cough, phlegm in the throat, some babies can also show vomiting bubbles, bruising around the mouth, breathing faster, more than 60 times a minute respiratory rate, sometimes accompanied by wheezing, the child because of phlegm wheezing and reluctance to eat milk, crying and irritability, poor sleep or excessive sleepiness, appearing These problems need to go to the neonatal unit of the hospital in time to have the lungs auscultated and, if necessary, photographed. If it is pneumonia, hospitalization is generally recommended and the doctor will give targeted treatment according to the child’s condition. The cause of the problem should be clearly identified so that it can be treated symptomatically. Do not confuse pathological changes with physiological changes and thus delay the condition.