Oo, very normal yan sa newborns, lalo na kung may darker skin tone kayo sa family! Ang labi ng babies ay usually meron na kaagad na slight pigmentation, at mas lumalaki pa siya around 8 days old dahil sa circulation at natural color development nila, a few of my mum friends had the same concern with their newborns at nag-normalize lang after a few weeks. But kung super concerned ka or kung parang ashy or unusual ang kulay (like may discoloration na suspicious), best to mention it sa pediatrician ninyo during the next checkup, just para sa peace of mind mo.