Este trabajo enfoca principalmente aspectos del desarrollo socio-pragmatico del nino en interacciones espontaneas y, en concreto, el fenomeno linguistico de la repeticion. Es asi como se realiza la caracterizacion formal y funcional de las repeticiones del propio enunciado (autorepeticiones) desde los planteamientos de la Linguistica Sistemica-Funcional y las investigaciones precedentes que abordan este topico. Los datos son recabados a traves del metodo etnografico en un taller de computacion recreativa. Se analizan 7 video-grabaciones en donde participan 15 ninos de diferente genero, entre 4 y 11 anos. Como resultados se tiene que existe una correlacion entre las formas linguisticas de la repeticion (formulacion linguistica y distribucion textual) y las funciones que estas desempenan. Ademas se observa que a medida que avanza la edad, los ninos desarrollan competencia para hacer uso de este dispositivo de forma estrategica: ganar la atencion del interlocutor, cambiar o modificar comportamientos, expresar actitudes y salvaguardar la imagen propia y la del otro. Abstract This work is mainly focused on aspects of children´s socio-pragmatic development in spontaneous interactions. Among the various linguistic devices that excel in the corpus of this research, we examine the linguistic phenomenon of repetition. This is how we perform the formal and functional characterization of the repetitions of the utterance itself (self-repetition) from the approach of the Systemic-functional Linguistics and the previous investigations that address this topic. Data are collected using the ethnographic method in a computer workshop recreation. 7 Recordings were analyzed, in which 15 children, 4 to 11 years old, of different genders take part. These findings include a correlation between linguistic forms of repetition (textual linguistic formulation and distribution) and the roles they play. We also noticed that as children grow up they develop competences in order to use this device in a strategic way: as to catch the attention of the interlocutor, change or modify behaviors, express one´s attitude and safeguard their own images and the others’.