Edit from UK man I was very blond as a boy up to the age of about 5 when my hair turned progressively darker eventually 10ish ending up fairly dark brown My first daughter whose mother had very dark brown almost black hair was also very blonde before school age but by 10ish had hair slightly lighter than mine which colour it has remained My second daughter different mother but also with dark brown hair had very blonde hair as a small child and although it has got darker her hair is still blonde at 9 when exposed to strong sun it turns very blonde almost white So this certainly does happen Because of mine and my daughters experiences I ve often talked to people about this and I am frequently told that brown haired people were blond as children or they have had children who were blond e and then turned brown My apologies for not signing this but I don t know how to do it