There are two types of Pompe disease: infantile, and late-onset. Infantile Pompe disease is the more serious, and often fatal. Because the young victims do not have the muscular strength to move normally, they are called "floppy babies".
龐貝氏症因發病年齡不同，分為「嬰兒型」及「晚發型」兩種，其中嬰兒型較為嚴重，常危及生命，罹病病童因肌肉無力無法行走，被稱為「趴趴兒」。