Baby with thick hair

Don't think there's any way to check, u'll only know upon birth. Hair is genetic so it depends on the mom and dad I guess. My boy came out with a head full of hair but as we did the Islamic head shaving 'cukur rambut' on his 1st wk, his hair has been growing quite slow since then. He's approaching 6 months but hasn't gotten back his thick hair like before. But I like it this way, easier to maintain 😆