Introduction: Investigations have shown that the emotional stress during the pregnancy period could have sustainable effects on the embryo .In High Risk Pregnant women the risk of babies with health, behavioral, and mood problems will be more. Different investigations have shown that the effect of relaxation training on emotional stress .This study was conducted to investigate the effect of progressive Muscle Relaxation Training on infant's outcome such as Apgar index, weight, height, head circumference, and jaundice in infants after delivery in High Risk pregnant women.
 
Materials & methods: The present study was done as a clinical trial on 150 High Risk Pregnant Women referred to Health and Medical Center in the city of Shahreza on 1392 -1393. High risk pregnant women were randomly divided into two groups. The control group only received routine pregnancy care and case group received routine pregnancy care and Progressive Muscle Relaxation Training (Jacobsen). At the time of delivery, infant's outcome including Apgar index, weight and height, head circumference, and jaundice was assessed.
 
Findings: Intervention and control groups in terms of demographic and obstetric variables were not significant (P>0/05). The results showed a significant difference between the two groups in height, weight, and head circumference (pvalue< 0/001).There was no significant difference between the two groups in Apgar scores in 1-5minute and jaundice.
 
Discussion & conclusions: According to this study, progressive muscle relaxation training is promoting and improving the health of infants in high-risk pregnant women. The progressive muscle relaxation training can be   safe and beneficial to pregnant women in order to improve the health of infants.