Objective: To describe a breastfeeding theory based on King's Conceptual System. Method: Theoretical study that used analysis of concept, assertion synthesis, and derivation of theory for the creation of a new theory. Results: King's system components were associated with elements of the breastfeeding process and a middle-range theory was created, which describes, explains, predicts, and prescribes breastfeeding by analyzing factors that precede and affect it, as well as their consequences on the breastfeeding process. Conclusion: The Breastfeeding Interactive Model is abstract enough to be applied in different social, cultural, political, and economic contexts, because it conceptualizes breastfeeding in systemic, dynamic, and procedural aspects. Based on a conceptual model of nursing, it contributes to the scientific construction of the subject; however it can also potentially be applied by other professionals involved in breastfeeding assistance.

Objective: To discuss the contribution of nursing theories in the conceptual expansion of good practices in the area for the construction of the unified health system (Sistema Único de Saúde – SUS). Method: Theoretical production of reflection, based on the neomodern framework of philosophy of science. Results: The knowledge and political, social and epistemological commitments of nursing are discussed, highlighting the relationship of the theories with good practices for the construction and application of knowledge in the area in the context of the Brazilian health care system. Reflection on how middle-range theories can help in solving dichotomies between discipline, theory, practice, producers and consumers of knowledge is made. Conclusion: Original reflections on the contributions of disciplinary and professional knowledge of nursing theories to the creation of SUS are presented, defending a creation through the academy-service partnership, in which the theories start being incorporated into a new concept of nursing practices aligned to neomodern principles of science.

OBJECTIVE To assess scientific evidence about the effects of maternal nicotine on infant by an integrative review. DATA SOURCES Studies published in Portuguese, English and Spanish, from 1990 to 2009, with abstracts available in the Latin American Health Sciences Literature (Lilacs) and Medical Literature Analysis and Retrieval System On-Line (Medline) databases. The descriptors were: "breastfeeding", "lactation" and "smoking". DATA SYNTHESIS The main identified effects of nicotine on infants were: changes in sleep and wakefulness patterns; reduction of iodine supply; hystopathological damage on liver and lung; intracellular oxidative damage; reduction of pancreatic ß cells; and decreased glucose tolerance. CONCLUSIONS It is recommended to inform mothers about harmful chemicals contained in cigarettes that can be secreted into breast milk. They should be strongly encouraged to stop smoking during lactation.

Objetivos: identificar en la literatura científica los principales factores asociados al destete temprano. Materiales y método: se trata de una revisión sistemática realizada en las bases de datos LILACS y MEDLINE con artículos completos del periodo de 2004 a 2013, en inglés, español y portugués, desde la pregunta orientadora: “¿Cuáles son los factores que influyen el destete temprano?”. Resultados: se identificaron 1.481 artículos y 39 atendieron a los criterios de inclusión. Entre los principales factores que influyen el destete temprano, se encontraron trabajo materno (33,3 %); uso de chupo de entretención (30,8 %); leche materna débil (17,9 %); trauma y dolor mamilar (17,9 %); introducción de otros tipos de leche (15,4 %) y nivel educacional de la madre o del padre (15,4 %). Conclusiones: diversos factores están relacionados al destete temprano, lo que apunta fuerte determinación sociocultural e histórica que se puede evidenciar por la comparación de los estándares de lactancia entre diferentes poblaciones y a través de los tiempos.

Purpose: to develop and validate a nursing process application in a neonatal intensive care unit. Method: a methodological study, conducted in a university hospital in southeastern Brazil from January 2017 to February 2018, divided into four stages: definition of requirements and elaboration of the conceptual model; generation of implementation and prototyping alternatives; testing and implementation. The app was developed based on Wanda Horta's Basic Human Needs and International Classification for Nursing Practice and following the User Centered Design method and the standards of the Brazilian Association of Software Engineering Technical Standards for IOS and Android platforms. The product was evaluated and validated by nurses for functional suitability, reliability, usability, performance efficiency, compatibility and safety. Results: the CuidarTech NeoProcesso de Enfermagemapp has screens that integrate the elements for history, diagnosis and nursing interventions. According to the judges' evaluation, it has functional adequacy, reliability, usability, performance efficiency, compatibility and safety. Conclusion: the app designed and validated by nurses is a computerized instrument that contains the stages of the nursing process: history, diagnoses and interventions, organized by Basic Human Needs and following the taxonomy of the International Classification for Nursing Practices. It relates information of newborns admitted to Neonatal Intensive Care Units and the nursing process, being able to provide quality, effectiveness, safety and personal satisfaction to the nurse's care.

Objective: To develop and validate Nursing Diagnoses statements of the International Classification for Nursing Practice (ICNP®) aimed at the care of people with chronic kidney conditions undergoing conservative treatment. Method: This is a methodological research structured in sequenced construction stages, cross-mapping, content validation by the Delphi Technique by specialist nurses, and categorization of Nursing Diagnoses. Results: Forty-two specialist nurses participated in the first round and 34 in the second. A total of 179 Nursing Diagnoses statements were prepared, categorized according to Roy’s adaptation model, of which 160 were validated for content, with Content Validity Index ≥ 0.80. Conclusion: The Diagnoses developed and validated show the modes of adaptation to health of people with chronic kidney conditions undergoing conservative treatment, influenced by biological, psychological, social, and cultural needs, with the Physiological Mode being the most prevalent.