Evaluate Efficacy and Safety in Chinese Patients With Infantile-Onset Pompe Disease With One Year Alglucosidase Alfa Treatment

Primary Objective: To evaluate effect of 52-week treatment with Alglucosidase Alfa in the extension of survival and improvement of cardiomyopathy measured by Left Ventricular Mass Index in Chinese patients with infantile-onset Pompe Disease. Secondary Objectives: * To observe the improvement of physical growth, motor and cognitive development of 52-week treatment with Alglucosidase Alfa in infantile-onset Pompe Disease from the baseline. * To observe the efficacy on survival free of invasive ventilation, use of any ventilation support of 52- week treatment with Alglucosidase Alfa in Chinese patients with infantile-onset Pompe Disease. * To evaluate the safety and tolerability of Alglucosidase Alfa in Chinese patients with infantile-onset Pompe Disease.