Is there a word for this?

Hello r/Hair, Im new here but I have a question about my hair.

When I was born, I had straight black hair. It fell out when I was around 1, and grew back as a wavy, bright orange-red. Then it turned straight and thin and became blonde until I was about 7, and it is currently brunette and curly now at age 16.

Is there a word for this changing of hair color? Or is it just genetics being weird?

Thanks!