This article discusses the launch of the Yellow Alert app by the Children's Liver Disease Foundation. The app is designed to be used by health professionals to assist recognition of prolonged jaundice in babies, and facilitate effective and timely decisions to support referral for specialist investigations. The convenience of an app is particularly useful for health visitors working in the community as they will be able to share accurate information and resources with parents at a time when they may feel most anxious. Jaundice does not necessarily mean that a baby is ill, but if it is prolonged (defined as persisting beyond 2 weeks in a term baby and 3 weeks in a premature baby), it should be investigated. A jaundiced baby can appear completely healthy; yet late diagnosis of childhood liver disease has potentially life-changing consequences and early recognition of symptoms is crucial to improve outcomes for these children. The universal health visiting service is ideally placed to recognise prolonged jaundice in babies and early symptoms that may indicate childhood liver disease.