Objectives: to create nursing diagnosis definitions for newborns in rooming-in care, using the International Classification for Nursing Practice (ICNP).
Methods: methodological study following the steps for the identification and validation of relevant terms to care for clients; cross-mapping of the terms identified with the terms of the ICNP® 2019; elaboration and validation of the nursing diagnostic definitions of ICNP® and later classification according with the Basic Human Needs described by Wanda Horta.
Results: from the terms extracted, 168 were validated through specialist consensus, subsidizing the elaboration of 27 diagnosis definitions.
Conclusions: the most common diagnoses for the clients studied were: "Effective Feeding Behaviour", "Effective Urination", "Normal Respiration Rhythm", "Effective Swallowing", "Effective Peripheral Intravenous Access", and "Effective Parent Child Attachment". It was confirmed that the records of psychobiological needs are mainly made by nurses, which were responsible for 23 of the diagnoses in this study.