My 8 month old son has a cold runny nose, coughing and sneezing what is the best solution for this?

See the doc: At 8 months with a cough his chest should be listened to.

Fever: He may have an upper respiratory infection or allergic reaction among other causes. Monitor his temperature, provide fluids and if he has a worsening cough, fever or signs of distress, please see your pediatrician. If a new food was introduced, watch for signs of rash and wheezing.