A substantial part of a paediatrician's work increasingly involves caring for children and young people with mental health, developmental, emotional and behavioural problems. Over time, recognition of these aspects has redefined and broadened the notion of what classically constitutes 'Paediatrics.' This paper discusses the ways in which paediatricians and psychiatrists can support each other in this work. It highlights the role of supervision and specifically advocates for the expansion of consultation/liaison psychiatry services.