10/15/2026
Fact #15 of 31: Is Down syndrome hereditary? π§¬
Translocation, a type of Down syndrome that accounts for 3 to 4% of all cases, is the only type known to have a hereditary component. About one-third of those cases, or about 1% of all cases of Down syndrome, are inherited.
For most families, Down syndrome happens by chance. ππ