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About The 5P Society 5p Syndrome is a chromosomal deletion disorder resulting in a wide spectrum of intellectual and developmental abilities. Each year in the United States approximately 50 to 60 children are born with 5p Syndrome also known as Cri du Chat Syndrome. These individuals will likely need a lifetime of support. Our Society is a support organization that works diligently to spread awareness of the syndrome and provides valuable information education and support for families educators and medical professionals in order to maximize the quality of life for those with 5p Syndrome.