Polysyndactyly occurs when a baby is born with polydactyly, which is extra fingers or toes (digits), and syndactyly, which is fusion of digits, on the same hand or foot. Polysyndactyly can be seen without any other abnormalities, called isolated polysyndactyly, or it can seen in combination with many other problems at birth, known as a genetic condition or syndrome. Some examples conditions that have polysyndactyly are Greig cephalo-polysyndactyly syndrome (GCPS), which causes polysyndactyly, eyes that are far apart (hypertelorism), and a large head size (macrocephaly), and hypertelorism-hypospadias-polysyndactyly syndrome. The only treatment for polysyndactyly is surgery to repair the digits. If your child has polysyndactyly, speak with your doctor to discuss the current treatment recommendations.