i know it kinda silly but since my son Kingston who almost 4months old i still wondering why he had light blonde hair while mine and his dad is brown.can anyone help me???

Totally normal! You never know what you're going to get! Plus, I think it's supposed to be like an "evolutionary" help. Lots of white babies are born blonde because they're easier to catch site of in the wild/out and about/from a distance with the light hair.

sight

Both me and my partner were born with bright blonde hair, now i have almost black hair and my partner has brown. Our son is also 4 months old... and he was born with dark hair lol

I think the hair colour isnt always depending on the paretns, but also the parents families e.g.. my friend had a little girl with red hair, but both her and her partner had brown hair. Turned out both parent's mothers were natural red heads

Two brown haired people can have a blonde child if they both carry a recessive (?) blonde gene, most likely if one of your parents and one of your partner's parents are/were blonde.

Two brown eyed people can also concieve a blue eyed child but two blue eyed people can never biologically have a brown eyed child