Introduction: Over a lifetime constant changes occur in the complexity and quality of the execution of motor actions,

Introduction: Prematurity may act negatively in the course of some motor skill, such as the independent walking acquisition. Objective: To identify the independent walking acquisition age in premature infants of different gestational ages, distinguish the period of independent walking acquisition among the lower economic classes and compare the independent walking acquisition with data in the literature. Method: This research is characterized as a developmental study. The sample is composed by 21 premature infants of both gender. Assessments and individual data collection were carried out monthly and at the end of the study, at the largest child´s living environment, and that every month the parents/caregivers previously received orientation and demonstration regarding the procedure for applying the stimulation protocol, presented in an illustrative and demonstrative primer. The instrument used for the monthly assessment was the Alberta Infant Motor Scale (AIMS) and the questionnaire of the Associação Brasileira de Empresas e Pesquisa (ABEP), to get the socioeconomic status of the children´s family. The results were analyzed using the Shapiro-Wilk test. Analyzed the age of ability to walk due to the low socioeconomic level through the Kruskal-Wallis test (C1, C2 and D). Results: When comparing the independent walking acquisition age and gestational age, the group with less than 33 weeks of gestational age acquired independent walking later than the group with gestational age between 33-37 weeks. However, it was found that the children average age of independent walking in the study was 14 ± 2 months. Comparing independent walking acquisition age and low economic levels (C1, C2 and D), the group with higher socioeconomic status (C1) acquired independent walking two months before the group with the lowest economic level. Conclusion: influenced positively the motor performance of premature infants in the acquisition of independent walking. Keywords: Movement, Infant Development, Early Intervention (Education). ResumoIntrodução: A prematuridade pode atuar negativamente no curso de alguma habilidade motora, tal como a aquisição da marcha independente. Objetivo: Visa identificar a idade de aquisição da marcha independente em prematuros de diferentes idades gestacionais, diferenciar o período de aquisição da marcha independente entre as classes econômicas baixas e comparar a idade de aquisição da marcha independente com dados existentes na literatura. Método: Trata-se de um estudo de caráter desenvolvimental. Fazem parte da amostra 21 crianças prematuras, de ambos os gêneros. As avaliações e a coleta de dados individuais foram realizadas mensalmente e ao final do estudo, no ambiente de maior convívio da criança, sendo que todo mês os pais/cuidadores recebiam, previamente, orientação e demonstração referente a todo processo de aplicação do protocolo de estimulação, presente em uma cartilha ilustrativa e demonstrativa. O instrumento utilizado para avaliação mensal foi o Alberta Infant Motor Scale (AIMS) e o quest...