Most coughs and phlegm in 10-month-old babies are caused by respiratory infections, such as upper respiratory tract infections, bronchitis or bronchopneumonia, which can be caused by bacteria or viruses, mycoplasma and other infections. Because of the young age of 10-month-old babies to be treated in a timely manner, if the baby is in good condition in addition to coughing, you can stop cough and phlegm medication at home itself. If there is no significant improvement after 2-3 days of oral administration, you need to take your baby to the hospital for X-ray chest examination and routine blood tests in time to give the corresponding regular treatment according to the doctor’s findings.