Sputum in the throat of 4-month-old babies is mostly seen in respiratory diseases, such as respiratory tract infections, physical or chemical irritation, and allergic reactions, and it is recommended to consult a professional doctor for symptomatic treatment. Common causes 1, respiratory tract infection: usually the color of sputum is white mucous sputum, yellow sputum, yellow-green sputum, mostly for the baby’s respiratory tract infection, resulting in local inflammatory reaction, increased mucus secretion of the respiratory epithelium, baby throat sputum; 2, physical and chemical stimulation: such as inhalation of cold air, dust, irritant gas or smoke, will also lead to the appearance of sputum, sputum can be white, which mixed secretions by oxidation Also appear yellow-green; 3, allergic reaction: common allergens including pollen, bacteria, proteins, fungal spores and the movement of hookworm and roundworm larvae in the lungs, causing tracheal and bronchial metaplasia, will appear white sputum. Treatment 1, nebulization treatment: can be through the expansion of bronchial nebulizer inhalation, to help expand the bronchial tubes to promote the excretion of phlegm; 2, oral medication: after clarifying the cause, follow the doctor’s instructions to take oral aminoglutethimide or oral cephalosporin antibiotics to prevent and control bacterial infection; 3, adjust the lifestyle and living environment: the baby’s bedroom should be frequently ventilated to keep the air fresh, room temperature to 18-22 ℃ is appropriate, if the air is dry If the air is dry, a humidifier can be used to keep warm, you can also put a pot of water in the room, or use a wet cloth to mop the floor, both of which can increase the humidity of the indoor air. Give the baby more water, also conducive to the respiratory tract mucosa to maintain a moist state, help the phlegm discharge. If your baby has dysplastic laryngeal cartilage, there will be a sound of phlegm in the throat from soon after birth. If your baby has only phlegm in the throat without phlegm discharge, which is more obvious when eating milk or sleeping, you need to suspect mild to moderate laryngeal cartilage softening and need to seek medical attention in time.