A baby can be born with extra fingers (polydactyly) due to a combination of genetic and unknown factors.
Here's a more detailed breakdown:
-
Genetic Inheritance: In some cases, polydactyly is an inherited trait. This means it runs in the family and is passed down through genes. Specific genes involved in limb development can have variations that lead to extra digit formation.
-
Spontaneous Genetic Mutations: Sometimes, polydactyly occurs spontaneously, meaning it's not inherited. This can be due to a new genetic mutation during the baby's development.
-
Syndromes: Polydactyly can also be a feature of certain genetic syndromes. These syndromes often involve a range of other developmental issues in addition to the extra fingers or toes.
-
Unknown Cause: For many infants with polydactyly, the exact underlying cause remains unclear. The extra division during limb development happens without a known trigger or genetic link. This is often referred to as isolated polydactyly.
In summary, while genetics play a significant role in some cases, the exact cause of polydactyly isn't always identifiable.
