Is there a cure for spinal muscular atrophy (SMA)?

I am sorry to hear that your child has SMA. I regret that no cure for this disorder exists. The life span is reduced too. You should continue passive exercises; be careful while feeding (keep her upright when feeding). Chest infection is common in these children. I can share in your sorrow, and Science must feel miserable that it has no cure for this disease. An advice I would like to offer is that prenatal testing is available for diagnosis of SMA, in case you plan another child. In that case tests done in the first 3 months of pregnancy can determine whether the baby is affected or unaffected with SMA.