When does complexion change?

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My son is now 6weeks and is very light skinned but hair starting to curl on top whereas by now my daughter was quite dark but with dead straight hair (her hair didn’t curl until she was a toddler)

What age did your babies get their colour/tone? And also when did their hair change/curl?

I was always told the tips on fingers show the colour baby will be but my sons have only just started to get some colour to his finger tips - before now he had no colour to them.

For some reason it won’t let me post a pic of my beautiful son