This is a quasi-randomised clinical trial, with 62 low-risk pregnant women in the second stage of labour. They were randomly allocated in control (CG) (n = 31) and intervention (IG) (n = 31) groups. The IG performed spontaneous pushing with pursed lips breathing while the CG was oriented to perform directed pushing associated with Valsalva Manoeuvre (VM). There was no difference between the groups regarding the occurrence of episiotomy (RR 1,1; 95%IC 1,0 to 1,2). However, there was a decrease in the duration of the maternal pushing by 3.2 min (MD 3,2; 95%CI 1,4 to 5,1) and a difference in maternal anxiety (Md (IQR) IG 46 (35-52), CG 51 (44-56) p:0,049), both favouring the IG. Spontaneous pushing was effective in reducing the duration of the pushing and showed a difference in maternal anxiety but did not decrease the maternal and neonatal outcomes. Brazilian Clinical Trials Registry (ReBEC) under the identifier: RBR-556d22IMPACT STATEMENTWhat is already known on the subject? Spontaneous pushing reduces the duration of pushing time when compared to directed pushing with VM but has no effect on other maternal and neonatal outcomes, based on a low quality of evidence.What do the results of this study add? No subject has been published on the subject. Our results suggest that the use spontaneous pushing with pursed lips breathing reduces the duration of the pushing by 3.2 min, also showing a difference in maternal anxiety. This result may indicate its use for emotional control when compared to the directed pushing.What are the implications of these findings for clinical practice and/or further research? These findings may signal an attitude in decision-making about guiding the breathing pattern in the expulsive stage.