Newborn baby feels phlegm, can not exclude the presence of respiratory infections, it is recommended to go to the hospital to let the doctor listen to the diagnosis, whether there is bronchitis or bronchopneumonia. If necessary, take a chest X-ray and have blood tests to see the extent of the infection. If the infection is mild, it can be treated with oral medication, such as tranylcypromine. If the infection is severe, it should be treated with intravenous medications such as penicillin and cephalosporins. At the same time, with nebulized inhalation methods, such as budesonide, etc., pay attention to drink more water to promote the dilution of sputum. For the mother’s diet, she must pay attention to light, easily digestible food and avoid spicy, stimulating food. She must keep warm, avoid getting cold, and avoid going to places where people gather to avoid aggravating the infection, developing fever, and even aggravating the cough.