5 month baby with a cold 🤧

Any advice on colds? Bubs 5 months and been coughing for about 4 days, irritable and not feeding well. No temperature, took him to the doc - no chest infection and they said to continue monitoring his temp and ensure he doesn’t have a fever.

He’s fine otherwise, blocked nose and heaps of coughing/sneezing and whinging it’s just hard to see..do these things just resolve on their own? Is there something more I can do for him apart from steaming/humidifier?