Baby 5 months old. Coughing every few days at night for about 5 days. …

Baby 5 months old. Coughing every few days at night for about 5 days. Today, coughing became too frequent in the morning. Nose is stuffy. Cough sounds like an allergic one and slightly moist. He used to cough when saliva gathered. How can you cure the cough quickly? Can you tell me how to make a physical solution at home?