This Sub-registry is a multicenter, international, longitudinal, observational, and voluntary program designed to track pregnancy outcomes for any pregnant woman enrolled in the Pompe Registry, regardless of whether she is receiving disease-specific therapy (such as ERT with alglucosidase alfa) and irrespective of the commercial product with which she may be treated. No experimental intervention is given; thus a patient will undergo clinical assessments and receive standard of care treatment as determined by the patient's physician.

The primary objective of this Sub-registry is to track pregnancy outcomes, including complications and infant growth, in all women with Pompe disease during pregnancy, regardless of whether they receive disease-specific therapy, such as ERT with alglucosidase alfa.

You may be eligible for this study if you meet the following criteria:

• Conditions: Glycogen Storage Disease Type II (GSD-II), Pompe Disease (Late-onset), Glycogenesis 2 Acid Maltase Deficiency
• Gender: Female

        Note: It is recommended that pregnancy data be collected on eligible women regardless of
        infant enrollment. In the event of patients having multiple pregnancies, participation in
        this Sub-Registry is encouraged for each individual pregnancy.
        Exclusion Criteria:
        There are no exclusion criteria for this Sub-Registry