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Becoming a parent is a major life event associated with changes in psychological well-being. Existing research has often focused on the long-term development of trait well-being, leaving several gaps unaddressed. The current preregistered study employed three waves of intensive longitudinal data, including 7-day experience sampling data per wave, to investigate psychological well-being trajectories across the transition to motherhood. This approach provides novel, detailed insights into the timing of well-being changes (beyond traditional annual assessments), explores developments in different change indicators (mean-level, intraindividual variability, and individual differences), and various well-being components (affective, cognitive, and meaning in life) during this critical life transition. Following 161 first-time Dutch mothers from 20 weeks of pregnancy to 6 months postpartum, we observed increases in positive affect and meaning in life, along with decreases in life and relationship satisfaction that occurred between pregnancy and 2–3 months postpartum, with no significant changes afterward. In contrast, no significant changes in intraindividual variability in well-being (i.e., well-being fluctuations from moment to moment and day to day) were observed throughout the transition. There were both similarities and differences between the trajectories of trait and mean-state measures of different well-being outcomes, and additional exploratory analyses highlighted how various daily predictors (e.g., sleep quality, infant crying) became more (or less) important for mothers’ well-being as they moved across the transition. The present study contributed to a better understanding of how the changes in a broad range of well-being components and other parameters unfold across the transition to motherhood. (PsycInfo Database Record (c) 2026 APA, all rights reserved).
