AbstractObjectivesMindful parenting (MP) interventions show promising results, but they mostly target parents (of children) with mental health problems. This study examined an online MP intervention for mothers with toddlers in a population-based sample. Aims were to assess acceptability and effectiveness of the intervention for mothers with and without parental stress, and examine their predetermined personal goals.MethodsThe study included 157 mothers with toddlers from the general population of whom 73 reported parental stress. The mothers participated in an 8-week online MP training. Questionnaires were completed at waitlist, pretest, posttest, and follow-up.ResultsMothers rated the training positively, although only 23.1% completed the training. Personal goals were analyzed qualitatively, establishing four different themes: attention, well-being, patience, and balance. Significant improvements in personal goals posttest and follow-up were found (large and very large effect size, respectively). We found no significant improvements from waitlist to pretest for all outcome variables, except personal goals (medium effect size). Mixed-linear model analyses showed significant improvements posttest and follow-up as compared to pretest regarding Self-compassion, Parental over-reactivity and Symptoms of anxiety and depression (small to medium effect sizes). There was an effect at posttest for Parenting problems, and for Parental role restriction at follow-up (small effect sizes). Levels of parental stress and theme of personal goal did not influence the effectiveness of the intervention.ConclusionsThe current study provides initial evidence that an online MP training could be an easily accessible, inexpensive, and valuable intervention for parents without an indication for a therapist-assisted intervention.Trial RegistrationDutch Trial Register (NTR7401)