A child coughing and spitting up white foamy sputum may be caused by an acute respiratory infection, or it may be caused by asthma. 1. After a respiratory viral infection, such as rhinovirus, respiratory syncytial virus and other infections caused by upper respiratory tract infections, bronchitis, bronchopneumonia, the child can manifest fever, cough, spit white foamy sputum and other symptoms. 2. If the child has a respiratory allergic reaction, such as cough variant asthma, bronchial asthma, etc., the child can show symptoms of cough, wheezing, spitting white foamy sputum. When the child often coughs and spits up white foamy sputum, you need to take your child to the pediatrician in the hospital in a timely manner to identify the specific cause of the disease, and to give the appropriate intervention for the cause of the disease.