Pediatric urolithiasis is a serious problem in our area with early onset of presentation. Stone location and its risk factors are similar to those in developing countries. BMI was not associated with urolithiasis in children in our study sample. Elaborating on the association between BMI and age at stone development may enhance our understanding of risk factors for pediatric nephrolithiasis. The relative contributions of individual metabolism, body mass composition and diet to stone formation in children remain unknown and should be investigated.