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Pretty sure it has to do with sex hormones, particularly the male ones. Prostaglandin drugs like latisse increase pigmentation. Melanotan is a self tanning drug that increases libido.

The melanocortin system is inextricably linked with sexual behavior. As James Watson pointed out.

Studies have shown that darker pigmented male individuals of many species, from lions to eagles to italians, are more agressive and territorial then their more lightly pigmented peers.

Women of the same race are more lightly pigmented than men.

So increased pigmentation seems to be associated with puberty and in particular, virilization.

When light increases in the springtime, the melanocortin system seems to turn on both libido and pigmentation, in time for mating season for many animals.

Why is it useful for juveniles to be light in color? Maybe lighter colored children look less threatening to co petitive violent males? Remember that these are legacy genes that control these traits. They seem to be the same across many species.

I could speculate that maybe blode hair is a good paternity test? If your wife is blond and you are blond and the kid has dark hair, something is up. Same with blue eyes. Therefore kids with lighter hair/eyes were less likely to be abandoned, killed, by a father suspecting cuckoldry. But I don’t really know.

It clearly has to do with sex hormones imo, but I am unsure of the selective pressures at play. But they are related to sex.

Tldr sex.

Testosterone in young men changes their hair. It does the same thing to foxes, there's a study in Russia documenting this

I was born with dark hair and blue eyes. My eyes became hazel-ey but there's still a bluish hue.

In summer my hair can get blonde streaks. I used to wish I was a proper blonde like my sisters when I was younger.

I had blonde hair and blue eyes as a child as well. Now, like you I have brown hair and hazel eyes. I keep my hair very long and it lightens in the summer, I'll get a few light brown and red hairs when I get a lot of sun. My eyes can look somewhere between green and brown depending on what I'm wearing. I've never heard a solid reason that for those changes either.

It's a curse for the crime that someone in your ancestral line was race-mixing. Parents get a glimpse of what could have been before the curse sets in and they are forever reminded of their ancestors crimes against humanity.

Also, STOP DESCRIBING YOUR PHYSICAL ATTRIBUTES TO THE KIKES MONITORING THIS BOARD YOU STUPID GOY!

I think I read somewhere the melanin increase happens gradually as one is exposed to more and more sunlight after birth but I couldn't find anything further about cause, or if that theory held any weight or have any research to back it up.

So if that theory is true I imagine there is a genetic range of "never going to be lighter than X shade hair/ eyes" and "never going to be dark then Y" but then for some years after birth the more sun or UV or whatever darkens one more than would be with less. If you had identical blonde, blue eyed twins and one lived in England and Equador, or one lived in the country and another in a city, would the one exposed to less sun have lighter features with age?

My brother in law is the same. Blonde haired, blue eyed baby, that later became dark brown hair and eyes.
My wife is similar, her hair color changes from week to week. She goes from strawberry blonde to redhead to auburn brunette. People constantly ask her if she dyed her hair

Because they're race traitors and charlatans!

Microplastics and Judaism

Northern Italian here, born with white hair blue eyes, hair tuned light brown at around 4 then medium brown around 13. Eyes still sky blue.

If you were blonde as a kid, it means you'll look good as a bottle blonde. I encourage all white women to go blonde if they can pull it off.

You told lies. Lucky you didn't tell to many or your nose and ears would have grown long.

Happened to me too
I was born with soft, brownish blonde hair that gleamed in the sun.
My parents even kept a lock of my hair in a scrap book.
When I became a toddler it shifted to black just like my father's.

The consequences of vaxxing us as children. I too was born with blonde hair and blue eyes and when I was around age 5 it turned brown and my eyes went Hazel.

I've got dirty blonde hair; it's not far from brown though. I started out platinum blonde as a kid, and as others have mentioned, I think there was some epigenetic change due to sunlight exposure maybe. It was sort of an abrupt change when I was 8. My brother started out platinum blonde too and remained that way. I was outdoors a lot, did a lot of camping, hiking, boy scout stuff, etc. My brother did too; so take that as you will. My eyes haven't really changed over my life though. They're still hazel and can appear blue or green depending on my surroundings and what I'm wearing and how much sunlight I've seen lately. My hair can lighten up too with sun exposure, enough to make people ask if I dyed it, but I don't think it leaves the dirty blonde range.

Interesting stuff...

Is it possible that this has something to do with immunizations received as a baby? Did this happen to people 150 years ago?

My hair was white blonde as an infant and gradually darkened over 20 years. My eyes are still blue. Two of my kids were born with darker hair than they have now. The hair that came in is noticeably lighter than what they had to start with. The third didn't have much hair but has the lightest brown of them all. Their eyes didn't change much. Two with blue like mine, one with hazel.