Resumo. ABSTRACT The aim of this study was to investigate the relationship between infant motor development, socio-demographic and the child’s home environment conditions. We evaluated 300 children aged between 36 and 42 months, who were enrolled in public schools for early childhood education in the city of Parintins/AM, together with their parents or guardians. The instruments for data collection were TMGD-2, AHEMD and ABEP. Prevalence ratios (PR) were obtained by Poisson regression by hierarchical analysis. The prevalence of developmental delay was 76%. The child’s gender and family income were statistically associated with the outcome. Boys had 31% more risk of developmental delay than girls. Children from families with income up to R$1,499.00 and from R$1,500.00 to R$2,499.00 were, respectively, 1.77 and 2.15 more likely to have developmental delay than children from families with monthly income equal to or higher than R$2,500.00.The results will form the basis and stimulus for interventions with parents, teachers and principals of kindergartens in the city of Parintins/AM, to clarify and provide healthy environments and with adequate stimulation for children, assisting in their development.