The MOMODa Foundation project tests the hypothesis that birth registration of unmarried adolescent girls (aged 14-17), coupled with a phone-based system for reporting of potential child marriage cases, can lower the incidence of female early marriage in rural Bangladesh. To test this hypothesis, the project is introducing a randomized controlled trial in 240 communities in Gaibandha district in northern Bangladesh with the following treatment arms: (i) one quarter of communities where the project offers, to households with unmarried girls, covering the cost of birth registration at local government digital centers; (ii) one quarter of communities where the project provides households with information on the Bangladesh government’s national helpline for reporting potential child marriage cases; (iii) one quarter of communities where the project offers to cover the cost of birth registration and provides information on the national helpline; (iv) one quarter of communities that serve as a control group.