Poor mental health accounts for 23% of all ill health in the UK, with the cost of treating it expected to double in the next 20 years. In addition, postnatal depression (PND) in both mothers and fathers can have a detrimental long-term impact on a child's cognitive, social and behavioural development. This paper discusses the development process of an innovative evidence-based resource which involved professional expertise and parent involvement. This unique resource helps to recognise PND in both mothers and fathers and will support health visitors in making a real impact in improving outcomes for children and families.