Educational disparities in mothers' parenting time have implications for socioeconomic inequality in children's resources and later life attainment. The reproduction of inequality could be more consequential if educational disparities are most pronounced at child ages when a specific parenting need is more developmentally important. Following recent findings suggesting a general reduction in the educational gradient in mothers' overall parenting time, this study aims to determine if this convergence extends to the developmental gradient in parenting. Using the American Time Use Survey from 2003 to 2019 (N = 34,232), this study finds that educational disparities in mothers' parenting time have narrowed in accordance with the developmental gradient. Economic, cultural, and demographic changes that might contribute to the narrowing trends are discussed. These findings offer an updated understanding of educational gaps in maternal parenting strategies, with potential impacts on the intergenerational transmission of (dis)advantage.