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Background: Alterations in spatiotemporal parameters during walking modify and limit movement capacity in children with obesity. This study aimed to describe and compare the alterations in spatiotemporal parameters in schoolchildren according to body weight during all phases of walking., Methods: We carried out a cross-sectional study of 94 schoolchildren aged 6 to 12 years and divided them into three study groups (normal weight, overweight, and obesity). Subsequently, we performed a gait study using a 3D motion analysis system and extracted the spatiotemporal parameters, and we compared the parameters obtained between the study groups., Results: The stride length in both limbs was lower in schoolchildren with obesity compared to the overweight group, with a mean difference of 0.08 m on the right side (CI 95% 0.01-0.16; p = 0.02) and 0.09 m on the left side (CI 95% 0.01-0.17; p = 0.02); also, on the left side, the swing speed (m/s) was lower in the children with obesity than in the normal weight group, with a mean difference of 0.23 m/s (CI 95% 0.03-0.43; p = 0.01). Lastly, the step width (m) was greater in the group of schoolchildren with obesity compared to the normal weight group, with a difference of 0.05 m (CI 95% 0.01-0.09; p = 0.01). A moderate positive correlation was found between the width of the step and the weight gain, r = 0.41 (p < 0.001). However, we found a poor correlation between right stride length (m), left side swing speed (m/s), left stride length (m), and weight gain, r = 0.26 (p = 0.01), r= -0.21 (p = 0.04) and r = 0.21 (p = 0.04), respectively., Conclusions: Spatiotemporal parameters such as stride length, swing speed, and step width were more altered in schoolchildren with obesity and correlated with body weight gain., Competing Interests: Declarations. Ethics approval and consent to participate: This study was approved by the Ethics and Research Committees of the Hospital Infantil de México Federico Gómez in Mexico City, with registration number HIM-2020-042, and all our investigation with human subjects included in this study was conducted by following the tenets of the Helsinki Declaration. Consent for publication: The present work does not include any individual person’s data; however, before conducting all the tests in this study, all participants and their respective tutors signed a consent and informed assent document. Competing interests: The authors declare no competing interests., (© 2024. The Author(s).)