6 months baby cold, runny nose, nasal congestion, need to clarify the cause of the symptomatic treatment, may be bacterial infection, viral infection and other factors related to the main medication, specific analysis is as follows:. 1. viral infection: 6 months baby if it is white clear snot with cough and other manifestations, need to be vigilant is caused by viral infection, need to rest, follow the medical advice to be sea saline rinse nasal cavity, reduce nasal secretions. 2. Bacterial infection: If the yellow nasal mucus and more viscous, suggesting that there may be a bacterial infection, can be cefozoxime, azithromycin and other drugs as prescribed anti-infective treatment. All of the above drugs need to be used under the guidance of a doctor, avoid self-medication to avoid danger.