Dark Navel Line..
Ok so I've read and heard you're suppose to get your navel line (i dnt know what its called lol) at around 16 weeks. I am going on 20 weeks and still nothing. Not even slightly there. When did you ladies get yours?
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It is a type of hyperpigmentation resulting from increased production of the pigment melanin thought to be caused by increased estrogen, the same process that causes the areolas to darken. Why this process of hyperpigmentation occurs on the midline of the abdomen is uncertain. Fair-skinned women show this phenomenon less often than women with darker pigmentation. Before it appears it may be more faintly visible as a white line.
Linea nigra tends to appear around the second trimester. After birth, the line fades slowly, but may never disappear entirely, and sun exposure may cause it to recur.
Courtesy of Wikipedia!