Massapequa resident Kaitlin Norton said she returned home from her daughter’s six-month checkup feeling content. According to her pediatrician, Madeline — a little girl with bright blue eyes and an infectious smile — was a healthy baby hitting all her milestones. But later that same day, Norton said she received the kind of call every parent dreads: Madeline had tested positive for a rare genetic mutation. Norton, 29, and her husband Gerard, 32, would later learn that the mutation, found in the PANK2 gene, meant their daughter had Pantothenate Kinase-Associated Neurodegeneration, or PKAN, a rare disorder that affects one’s ability to walk and talk. For many, the life expectancy is 10 to 12 years. Read more on how these parents are searching for a cure at the link in bio. #longisland #longislandny #liny #longislandnewyork #nassaucountyny #nassaucounty #massapequa #massapequany #PKAN #geneticdisorder #PKANdisorder #raredisorder #disorder #genes #pediatrician #medical #doctor #condit...