Charlie, who is ten weeks old, has been brought to see you by his mother Josie and older sister Sarah, aged four. Josie informs you that Sarah was seen earlier in the week at the GP surgery, with coryzal symptoms and a barking cough which has responded well to a dose of Dexamethasone.

However, Josie has noticed that Charlie has developed a runny nose and a similar sounding cough. He is otherwise well, his feeding is slightly reduced but he is wetting nappies and is settled when asleep. On examination, Charlie is easily rousable, his fontanelles are unremarkable, he has sternal recession at rest and his chest is clear. There are no rashes.

On examination:
Pulse rate 150
Respiratory rate 52
Temperature 36.7
Capillary refill less than 2 seconds

What is the most appropriate management?