Background Cross-boundary working is a key policy objective. Cross-boundary working provides the foundation for high quality provision across child health services and is imperative for an effective child protection system and the support of children and young people with health needs. Methods Two participative conferences were attended by 113 stakeholders utilizing the World Cafe focus group method. Most (87%) of the sample were nurses, midwives or health visitors. Results Many examples of cross-boundary working were identified across the different areas of practice. Remarkably few transdisciplinary examples were identified in contrast to the number of inter-agency examples. Intra-organizational boundaries across the health service were also noted. Conclusions Considerable cross-boundary working was reported but transdisciplinary working is not yet well established across all areas of child health provision.