The authors recall the characteristics of infantile staghorn calculus, in relation to twenty personal cases. The complaint is more frequently encountered in boys than in girls. A frequent etiology is proteus urinary infection. The morphology of the staghorn and the state of the parenchyma are determining factors in the treatment. A sinusoid morphology and thickness of the renal parenchyma are operative indications. The bivalving operation is exceptional. Results are generally satisfactory (80% of cases), and recurrences are rare.