5 month baby with cold 🤧

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Any advice on colds? Bubs 5 Months now .. 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?