BackgroundMass media can play critical roles in influencing parents’ attitudes and practice toward the healthy upbringing of children.ObjectiveThis study examined the association between the use of five types of mass media among mothers living in rural and urban areas and the early childhood development (ECD) of their children.MethodsWe analysed nationally representative and internationally standardized Multiple Indicator Cluster Survey data collected in 2013 and 2019 in Bangladesh. The ECD was calculated using four domains of development: physical health, literacy-numeracy, learning and social-emotional. Mothers’ use of newspapers/magazines, radio, television, internet and mobile phones was the study factor. We used Poisson regression with robust variance. The dataset included 27,091 children aged three or four years.ResultsAlmost 21% of the children were living in urban and 78% in rural areas. Mothers/caretakers of 30% of the children used none, 39% used one, 25% used two, and approximately 6% used three or more of the five types of media. Mobile phones and television were the dominant types of media, both in terms of the number of users and the frequency of use. Overall, 68.87% of the children were on track in terms of their ECD and 31.13% were not. A significantly larger proportion of urban children (74.23%) than rural children (67.47%) were on track in their ECD. The prevalence of children being on track of ECD increases by 4% (aPR 1.04; 95%CI: 1.01–1.06) for each additional media use among women who lived in urban areas and increases by 7% if women live in rural areas. In terms of the individual formats of media, using newspapers, television and internet was found to be significantly associated with the children in rural areas being on track in terms of their ECD. In the urban sample, only radio use was found to be significant.ConclusionsTargeted and well-designed child development campaigns that are delivered through popular media types are likely to help mothers to take better care of their children.