Brachydactyly is a shortening of the fingers and toes due to unusually short bones. This is an inherited condition, and in most cases does not present any problems for the person who has it. There are different types of brachydactyly, based on which bones are shortened.

Why do I have a weird thumb?

More commonly referred to as "clubbed thumbs" and often comically called "toe thumbs" (delightful!), brachydactyly type D is an inherited condition in which "the end bones of the thumbs are shortened but all the fingers are normal," according to HealthLine.

What do clubbed thumbs mean?

A clubbed thumb is a term used to describe the genetic clubbing of one or both thumbs. It is characterized by a particularly short thumb that is round in section and bulbous at the end. The thumb nail is very wide and short. Clubbed thumbs are historically thought of as a sign of royalty.