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Background The average percentage of births by cesarean section worldwide in 2014 was 18.6% (range: 1.4% to 56.4%), and in Latin America and the Caribbean 40.5% [range: 5.5% - 55.6%]. In Mexico, the cesarean delivery rate remained above 40% in the period from 2008 to 2015, and without signs of decreasing, the World Health Organization recommends up to 15% maximum. The objective of the study was to decrease the rate of deliveries by cesarean, through continuous intrapartum support during the active phase until birth.Methods Experimental study, open label, carried out in a public health institution in Mexico, during July-December 2018, with a study population of N = 115 women in labor (nulliparous, term, singleton, vertex) and under 40 years old, was formed a control group (n = 55) who received routine maternity care and a study group (n = 60), who received continuous intrapartum support during the active phase until birth by a professional nurse with a university degree.Results In the study group, the cesarean delivery rate was 1.7% (1 of 60), significantly lower than that of the control group, which was 29.1% (16 of 55) [X 2 = 17.13, df = 1, N = 115, p < .001], with a risk ratio of 0.06 (95% CI: 0.01 to 0.42), the absolute risk reduction was 27.4%, (95% CI: 15% to 40%), also, the hours of labour were significantly lower with a median of 6.7 hours in the study group versus a median of 13.4 hours in the control group,Conclusion Continuous intrapartum support provided by a professional nurse in the active phase helps to reduce the rate of cesarean deliveries, as well as to reduce the time of labour in women (nulliparous, term, singleton, vertex) under 40 years of age.