An integrated theory based-educational intervention to change intention to have a child: study protocol of a cluster randomized controlled trial.

Background: In high- and low-income countries, declining birth rates have become a global concern. Couples do not have enough information about the complications of delaying and reducing childbearing and this leads them to make inappropriate decisions. Therefore, this study aims to evaluate whether an educational program based on integrating the Theory of Planned Behavior (TPB) and the Trans-Theoretical Model (TTM) affects child-free couples' intention to have children and minimizes the consequences of this decline.