Did you have little to no hair when born? Did it take forever to grow in (12-18 months)?

Both of my kids and I were born with very little hair. My daughter's hair took forever to come in and when it did it was curlier than mine. I couldn't tell how curly hers was going to be at first because it was so short and started out wavy. My 7-month-old baby boy has even less hair than my daughter did at the same age. His hair has grown, at most, a half-inch in the last 5 months. So, I assume he's going to have curly hair.