Baby boy - linea nigra

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I had a DARK linea nigra with my first two babies. Neither of them had one after birth.

I had no linea nigra while pregnant with my third, but he does! He’s 8 weeks old and it’s getting darker, as well as his belly button. Anyone else have baby boys with this? I read it’s not very uncommon with baby girls but is less common with baby boys. How long did it take to go away?