Baby’s hair color changing?

My baby girl is almost 4 weeks and I’m noticing her brunette hair is growing lighter roots! Almost like her hair was dyed brown and blonde roots are coming in! I’m brunette and my husband is dark blonde. I had light honey colored hair when I was little and he was platinum blonde. When I was pregnant I imagined my baby girl with his blonde hair and was surprised she had a lot of dark brown hair.. (almost a little darker than mine!) Anyone else’s baby’s hair changing?