The medical term for having an extra finger or toe is polydactyly (pol-ee-dak-tuh-lee). The term literally means “extra digit.”
Usually, a child has the extra digit next to the thumb, big toe, little finger or little toe.
The extra digit may range from a small bump to a fully – developed, working finger or toe. Most often, it’s smaller than the other digits and not well formed.
The extra digit may be connected by skin, muscle or bone. Your baby’s healthcare provider may take an X-ray to see how much bone is involved. This determines how or if surgery is needed.
Last Updated 07/2019
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