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Prader–Willi syndrome is a rare genetic disorder in which seven genes on chromosome 15 (q 11-13) are deleted or unexpressed (chromosome 15q partial deletion) on the paternal chromosome, a congenital (present from birth) disease that involves obesity, decreased muscle tone, decreased mental capacity, and sex glands that produce little or no hormones. This caused by a gene missing on part of chromosome 15.

Signs of Prader-Willi syndrome may be seen at birth. Newborns with the condition are often small and very floppy.

During the school years, children benefit from a highly structured learning environment as well as extra help. Speech and occupational therapy are also indicated.

During infancy, subjects should undergo therapies to improve muscle tone.The largest problem associated with the syndrome is severe obesity.Prader–Willi syndrome has no cure, however, several treatments are in place to lessen the condition’s symptoms.

For Treatment, Obesity represents the greatest problem to health.Parents should discuss the possible side effects with the child’s doctor.Limiting caloric intake will control the obesity but the family, neighbors, school, and other institutions must cooperate closely as the child will attempt to obtain food wherever possible.A very small penis in the male infant may be corrected with testosterone.