If a 1-year-old child has a cough with phlegm, different treatments can be used depending on the cause: 1. You can drink warm water several times to replenish water. 2. Parents take a sitting position and hold the baby up on their lap, and parents pat the baby’s back with a hollow palm from bottom to top, if the phlegm can be vomited out or brought out with the cough, it will be more comfortable. 3. You can treat cough and phlegm symptomatically by taking cough and phlegm medicines. 4. Pay attention to keep the humidity in the room in a more ideal state, which is also conducive to the discharge of phlegm.