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Is there any gender link between a dark or light linea nigra?

Visible in many pregnant women, a linea nigra is a dark vertical line about one centimetre to half a centimetre in width extending from the belly button to the pubic bone. It due to the increased levels of oestrogen in the body and exhibited by 75% of all pregnant women, becoming more apparent as the foetus gets bigger. Some say that a darker line means that you’re having a boy and that a feint or absent line means that you’re having a girl. There is no research behind this and many mothers will tell you that they had a dark line but had a girl and vice versa.

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