I currently have blonde hair. It's when you have low levels of the dark pigment eumelanin.
I have black hari but I used to have brown and then red hair when I was a baby!
Really? Red hair is rare. It occurs naturally in 1 to 2 percent of the population!
Wow that is crazy, I had no idea it was that rare!
It occurs more frequently in people of western European ancestry.
That is curious, I wonder why that is, but I did not know you could lose having red hair!
I know as a baby it's not uncommon to have your hair color change. 
I did not know that actually, learn something new every day!
Also the word "blond" comes from the Old french word "blund, blont" which means a color midway between golden and light chestnut.
Huh, I did not know that either, the word just always made sense to me, but I guess it is sort of a light gold!