Transition to parenthood is an important period of human growth and development in the family life cycle that has many positive and negative consequences for a couple's life. The researchers suggest that attachment orientation plays an important role in how to pass from this period. In this article, the relationship is examined between adult insecure attachment and the jealousy of spouse-child relationship in transition to parenthood in a sample of 384 adults whose first child was up to three years old. The research participants responded to the Experiences in Close Relationship Scale and the Prenatal Jealousy Scale. For data analysis, statistical methods (mean, standard deviation, correlation coefficient, regression, independent t, and analysis of covariance) were used in SPSS 23. The findings show that there is a significant positive relationship between attachment anxiety and the jealousy of the spouse-child relationship in transition to parenthood. But there is not a significant relationship between avoidance attachment and jealousy of the spouse-child relationship in transition to parenthood. Also, gender differences in jealousy, attachments anxiety, and attachments avoidance are significant. The mean score of jealousy and attachments anxiety and avoidance were higher in women than men. This article is suitable for this journal because of its psychological taste and family as its case study.

Keywords: Attachment insecurity, Jealousy, Spouse-child relationship, Transition to parenthood, Attachment