Sialolithiasis rarely occurs in children and usually affects the submandibular salivary gland. Because of its rarity, its clinical expression is frequently missed and diagnosis is delayed. We describe the case of a 9-year-old boy with submandibular sialolithiasis who presented spontaneous passage of a large salivary stone. We review the clinical findings and etiopathogenesis of sialolithiasis in children, as well as diagnostic imaging techniques and several therapeutic approaches to stone extraction.