Objetive : To determine the prevalence of clinical characteristics in deciduous dentition and its association with sex and age in children from 3 to 5 years old. Material and methods : It was an observational, analytical, cross-sectional and prospective study, whose sample consisted of 165 children enrolled in the garden of the “Nino Jesus” school during 2018. All related biosecurity measures and prior informed consent are applied. The data were recorded in clinical records, the observational , structured and participatory technique was use. Respect for the statistical analysis was by means of a descriptive statistic and Pearson’s Chi Square test. Results : they were as follows: the most prevalent molar relationship was the mesial step with 78.5%, as for the Baume arch type it was Iwith 37.6 %, the presence of primate spaces with 62.4% and 69.1% respectively. No diferences were found regarding the relationship with sex and age, since in sex the value was p=0.644 and in age p=0.397. Conclusions : obtained a prevalence of 74.5% of children with at least one clinical characteristic of future predisposition to malocclusion in dentition. There were no statistically specific differences between the association of these clinical characteristic of malocclusion with sex and age.