Introduction: Development is the changes in physical growth of a child. It also includes the changes in the child’s social, emotional, behaviour, thinking and communication skills. Development is the key phenomena which control the body structure and functions through gross motor skills, fine motor skills, language, and social personalities. As a result of Developmental delay or Global Development Delay a child takes longer to reach certain development milestones than other children in their age. This is related to learning to walk or talk, movement skills, learning new things and interacting with others socially and emotionally. If there are any developmental disorders in children, it will result in several possibilities, namely delays in children’s speech, delays in general psychomotor development, sensory, neurological disorders for hearing, Down syndrome autism. This study aimed to determine the relationship between psychosocial stimulation and the development of toddlers aged 1-3 years. Methods: The research was conducted in October 2019 - February 2020 in the Public Health Centre in Padang, Indonesia with population of all mothers who have toddlers aged 1 - 3 years. Selection of sampling was consecutive sampling method with a minimum sample of 65 respondents. Results: Based on the results of the study, it was found that some respondents received less psychosocial stimulation, namely as much as 46.2%, and toddlers aged 1-3 years experienced devel- opmental disorders as much as 18.4%. Based on the results of statistical tests, it can be said that toddlers who did not receive sufficient psychosocial stimulation might experience the development delay with chance of 0.600 times greater than toddlers who are good getting psychosocial stimulation. Conclusion: The analysis of results shows that the value of p = 0.029 (P ï‚£ 0.05), means that there is a significant influence between psychosocial stimulation on the development of toddlers aged 1 - 3 years.