Subject: How common is it to have blond hair as a child and is it a dominant trait?

My wife and I have two young children, both of whom have blond hair – in fact 
our 3-year-old son had almost white hair at one stage.  Both my wife and I were 
blond as kids but started to get browner hair at about the age of 6 and now 
have very dark brown hair (…hence we often get asked were the kids’ blond hair 
comes from….).  All of us have brown eyes, although my son and I have some 
hazel.  In my extended family it is common to be blond as child and over time 
to develop dark brown hair - even becoming black later in life (if it hasn’t 
fallen out by then).

I know it is not uncommon of Europeans (such as my wife and I) to start of with 
blond hair and get darker over time.  But I was wondering how common this 
actually is?

In New Zealand it is not uncommon for a European to marry someone of Maori or 
Polynesian descent and to have children that start of as partially blond or 
yellow hair only to develop the typical black curly hair later.  

Does this mean that blond hair as a child is a dominant trait as opposed to a 
recessive trait like the true blond hair?

(their was a previous question similar to this in the archives, however focused 
more on how it happens).

Re: How common is it to have blond hair as a child and is it a dominant trait?