When a 1-month-old baby has a runny nose, the condition can be caused by catching a cold or a cold caused by too much heat. It may also be related to the fact that the caregiver has a respiratory disease that was transmitted to the baby. In this case, you must isolate yourself from adults with colds. Breastfeeding mothers with colds can continue to breastfeed if they don’t have a fever, and it’s not recommended to stay in the same room as the baby, and the baby’s room should be ventilated and disinfected diligently. The temperature in the room should be around 22℃ and the humidity should be maintained at 50%-60%. If the child has more clear nasal mucus, nasal congestion seriously affects breathing and breastfeeding, you can give him 3-5 days of pediatric cold medicine, and at the same time use physiological sea saline spray nasal cavity. If the child develops a cough or develops a fever, as long as the temperature exceeds 37.2 ° C, in this case it is necessary to go to the pediatrician’s interview to exclude tracheitis or bronchitis.