A linea negra (also linea nigra, pregnancy line or belly button line) is a dark line on abdomen. It runs vertically from the navel down to the pubis and sometimes up to the top of abdomen. It is usually a side effect of pregnancy for pregnant women.
Linea Negra (Belly Button Line): Long or Short
It’s said the long belly button line of expectant mother which extends all the way up to the top of tummy means boy while the short line which stops at your belly button means girl.
Linea Negra (Belly Button Line): Thin or Thick
The thin belly button line of mother-to-be generally means boy while the thick means girl.