A 3-month-old previously well boy presents with 24 hours of cough, rhinorrhoea and increasing work of breathing. He has a low-grade fever, tachypnoea, subcostal indrawing and diffuse crackles and wheeze on auscultation. Oxygen saturation is 93% on room air and he is feeding adequately. According to CPS bronchiolitis guidance and Choosing Wisely, what is the most appropriate management?