I'm not very good in English but here's my thought about the Fl's baby

Here's my idea about the black hair of the fl's baby.I believe that the fl's childhood best friend which was the white haired dude was originally has black hair because if you look on page 5 when the white haired dude got kidnapped. He has black hair on the first panel then on the next panel his hair turned white. At first, I thought it was a mistake but if the fl's baby has black hair and she said that the white haired dude was the father of her baby, then Fl's childhood friend originally has black hair, I think(づ￣ ³￣)づ