I am curious...

My baby was born with dark brown hair. Now his hair overall looks lighter (now medium brown) and there is blond, baby hair underneath.

Is this the same with other mamas with brunette babies?

And is it possible he could still go blonde on me? I always had dark brown/black hair all my life, and my partner was blonde when he was younger. His sister was born with dark brown hair but turned blond when she was 1 and stayed blonde for the rest of her life.