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Introduction: The birth rate has been declining worldwide since the last decades, so it is important to investigate its changes. Objectives: To quantify the trend of births in Chile according to age range of the mother and biological sex of the newborn in the period 2015-2020. Methodology: An observational and ecological study was conducted, with data obtained from the World Bank and DEIS, for population and births respectively. Data were divided according to maternal ages into three groups: <18 years, 18-34 years and ≥ 35 years. No ethics committee was required due to the fact that we did not intervene with individuals. The authors have no conflict of interest. Results: A decrease in births of 22.6% was observed, from 244,626 in 2015 to 189,250 in 2020. Births in the age group of mothers under 18 years decreased by 82.13%, decreasing from 17,505 to 3,129, the maternal age range corresponding to the second group from 18 to 34 years, located the highest number of births, remaining around 77.75% (net), the range ≥ 35 years, presented a rise of 17%, increasing from 34. Discussion: In Chile there is a decrease in births due to the fact that motherhood is being postponed, which may be due to the sexual education implemented in the country and the greater participation of women in the labor market, suggesting a transition from a stable demography to a regressive one. [ABSTRACT FROM AUTHOR]