“There is a 1 in 4 chance the child has SMA, 1 in 4 chance the child inherited 2 healthy copies of the SMN1 gene and a 1 in 2 chance the child is a carrier.  While there’s no cure for SMA, treatment can help. Home modifications, medications, assistive devices, physical and occupational therapy, and feeding and breathing assistance are all things that can make living with SMA easier.”.

healthline (https://www.healthline.com/health/spinal-muscular-atrophy/spinal-muscular-atrophy-facts-stats#types-and-symptoms)