Hair texture is polygenic — many genes contribute, with no single dominant rule. Here’s a probability across the texture spectrum based on what each parent has.
Mom’s texture
Dad’s texture
Most likely texture
Curly40% likely
Hair texture often changes over the first 2-3 years — newborn hair is rarely the final answer.
The full distribution
Straight15%
Wavy35%
Curly40%
Coily / kinky10%
How accurate is this, honestly?aboutPolygenic
AccuracyPolygenic
Hair texture genuinely changes — many curly-haired adults had stick-straight baby hair, and vice versa. The TCHH gene is the strongest known driver, but at least a dozen other genes matter. The hair you\u2019ll see at age 5 is a much better predictor than the hair at month 5.