BACKGROUND: With the increasing use of developmental screening tools, there is a growing need to validate parental screening methods for the early detection of developmental difficulties in children, regarding their psychometric properties. METHODS: This study evaluates the convergent validity of the S-PMV11 parental screening tool by comparing its outcomes with the Bayley Scales of Infant and Toddler Development (Bayley-III), the gold standard for direct assessment. RESULTS: We analyzed data from 30 children and found significant correlations between S-PMV11 scores and Bayley-III assessments across cognitive, language, and motor skill domains. Notably, expressive communication showed the strongest correlation, indicating that parents are reliable assessors of developmental risks. CONCLUSION: Despite limitations related to potential overestimation in Bayley-III, our findings support the S-PMV11 as a valid tool for early identification of developmental challenges, enhancing early intervention strategies in pediatric healthcare.