Resumen: The aim of this paper is to analyze the relationship between oral language (morphology, syntax, semantics and pragmatics) and mathematics competencies (counting, numbering, Arabic numeral system, oral numerical system, logical operations, operations with arithmetic statement, operations with verbal statement and size estimation) moderated by sex and month of birth. For this, the BLOC-SR and TEDI-MATH tests have been administered to 13 children in the first year of elementary school. The results show existing relationships in some of the dimensions of oral language and calculus. Specifically, children who score higher in oral language (BLOC-SR) tend to obtain better results in calculus (TEDI-MATH), but the difference in the means in calculus of students who score above the language mean oral is not higher than the mean of students who score below. Furthermore, this paper examine the role of sex and month of birth on the relationship between oral language and mathematics competencies. Idioma: Inglés DOI: 10.15405/epsbs.2020.05.35 Año: 2020 Publicado en: The European Proceedings of Social & Behavioural Sciences 84 OPIICS 2019, 35 (2020), 320-330 ISSN: 2357-1330 Originalmente disponible en: Texto completo de la revista