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Objectives Caregiver-mediated interventions like Naturalistic Developmental Behavioral Interventions (NDBIs) show positive outcomes for children with developmental disorders, including autism. However, access remains limited in low- and middle- income countries (LMICs) and marginalized communities. The WHO-Caregiver Skills Training (WHO-CST) program addresses this gap by offering a scalable solution in over 35 countries. As CST is caregiver-mediated, we examined changes in caregiver fidelity, defined as the consistent, accurate use of CST strategies at home.Method Twenty-four caregivers of children aged from 2 to 8 years (M=4.79, SD=1.39) suspected or diagnosed with autism or a related condition. The percentages for girls and boys were 23.1% and 76.9% respectively. The vast majority, 91.67%, of caregivers were immigrants (i.e., not born in Canada). The program includes 9 group sessions and 3 home visits. Caregiver-child interactions were video-recorded and coded using the Adult-Child Interaction Fidelity Scale (ACIFS) at three time points: pre-intervention (T1), mid-intervention (T2), and post-intervention (T3). Coding was conducted by a blinded rater with strong inter-rater reliability (ICC=0.75).Results Over the three home visits, caregivers showed improvement in aligning their communication with their child’s level (Time 1 M=0.71, SD=0.81; Time 2 M=1.08, SD=0.83; Time 3 M=2.90, SD=0.97). A repeated measures ANOVA showed a significant effect of time on caregiver interaction behaviors, F (2, 46)=54.38, p<0.001.Conclusions Findings suggest that WHO-CST supports improvement in caregiver interaction fidelity. Further research is needed to explore predictors and moderators associated with these behavioral changes.