Background and Objective: Knowledge of bone and dental age is important for pediatricians and pediatric dentists. This study compared dental age, bone age, and chronological age in underweight children. Materials and Methods: 100 underweight children aged 8-14 years were assessed. Chronological age recorded from birth date, dental age via orthopantamogram (Demirjian method), bone age via hand-wrist radiograph (Bjork, Grave, and Brown method). Results: Dental and bone age were delayed compared to chronological age in both sexes. Positive correlations existed between chronological, dental, and bone age in males. Interpretation and Conclusion: Delayed dental and bone age is a notable feature in underweight children, important for diagnosis and treatment planning. Larger, controlled longitudinal studies are warranted. © 2014 Elsevier B.V., All rights reserved.