Three-month-old baby cough with phlegm in the throat, may be related to viral, bacterial and other infections, need to pay attention to daily care, if necessary, under the guidance of the doctor to give medication and so on. Specific analysis is as follows: 1. Daily care: baby in the throat with phlegm cough, usually pay attention to keep warm, drink more warm water, light diet, do not eat cold stimulating food. Do not be too dry indoors, maintain air circulation and environmental cleanliness and hygiene, try to avoid taking children to densely populated public places and so on. 2. medication: three months old baby throat phlegm cough, mainly and body inflammation related, such as bacterial infection, viral infection and other factors, it is recommended to take the baby to the hospital for examination, such as bacterial infection treatment is mainly cephalosporin and other antibiotic treatment, if the viral infection caused by the general need for special medication. In addition, if the baby cough sputum is more, also need to cooperate with the nebulizer treatment will be better, the above drugs are taken under the guidance of a doctor, not to use on their own.