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Objective: This study aims to see the effect of yoga exercises on a cortisol hormone level and an infant outcome. Methods: This study used a cross sectional study design. The sample was 80 third-trimester-pregnant women. The sample was divided into two groups, 40 women were given yoga exercises and 40 women were not given yoga exercises. Data were analyzed using Chi-square test, independent T test and Mann Whitney U test. Results: The result of this study shows that there is an effect of yoga exercises on a cortisol hormone level with a value of ρ 0.0001 <0.05, there is no effect of yoga exercises on birth weight with a value of ρ 0.67> 0.05, and there is no effect on yoga exercises on gestational age with a value of ρ 0.68> 0.05. In the control group,a high cortisol hormone level does not affect the normal birth weight and LBW with a value of ρ 0.72> 0.05.At NBW control group and LBW intervention group,a low cortisol hormone level does not affect the birth weight with a value of ρ 0.23> 0.05.In the intervention NBW group and LBW intervention, a low cortisol hormone level affects the normal birth weight and LBW with p values = 0.018 <0.05.In the mature control and preterm control group, ahigh cortisol hormone levelhas no effect on the age of mature or premature gestation with a value of ρ 0.17> 0.05.And at the control mature group and maturity of the intervention group, a low cortisol hormone level affects the gestational age with a value of ρ 0.001 <0.05. Conclusion: It can be concluded that there is an effect of yoga exercises on a cortisol hormone level but it does not affect the outcome of an infant.