["Journal of Child Psychology and Psychiatry, EarlyView. ", "\n\nBackground\nLanguage is an essential skill for learning and academic achievement; therefore, children with developmental language disorder (DLD) are at risk for learning difficulties. Previous research has indicated a higher prevalence of mathematical difficulties in children with DLD compared to control children without such difficulties. However, the extent to which DLD and mathematical difficulties co‐occur, as well as the nature of the difficulties, remains unclear.\n\n\nMethods\nWe performed a meta‐analysis of 30 studies examining the mathematical skills of children with DLD compared to controls and examined moderators related to children's age, cognitive abilities, mathematical domains, diagnostic status, and publication type.\n\n\nResults\nChildren with DLD performed approximately 1 SD (Hedges' g = −1.03) below age‐matched controls in mathematics. Group differences were moderated by the type of mathematical task, with children with DLD being more impaired in arithmetic, counting, word problems, and composite math skills than in tasks evaluating Arabic number knowledge and magnitude judgment. There was a small‐study effect, but publication bias was not confirmed.\n\n\nConclusions\nChildren with DLD perform considerably more poorly than controls in mathematics and are at a high risk of mathematical difficulties. This supports the notion that these children have a complex profile of difficulties.\n\n"]