Understanding Your Baby: protocol for a controlled parallel group study of a universal home-based educational program for first time parents.

Results will provide evidence regarding the efficacy of UYB in promoting parenting competences. If proved effective, the study will represent a notable advance to initiating the UYB intervention as part of a better infant mental health strategy in Denmark. Conversely, if UYB is inferior to CAU, this is also important knowledge in regard to promoting parenting competence and infant mental health in a general population. Trial registration https://ClinicalTrials.gov with ID no. NCT03991416. Registered at 19 June 2019-Retrospectively registered, https://clinicaltrials.gov/ct2/show/NCT03991416.