Having seen most women during their term of pregnancy, one phenomenon has also confounded me-the dark vertical line which appears and runs from between the breasts to the genital.I've assumed that this is a consequence of the stretching of the solar plexus' muscle.But upon further research,I discovered that while most women get the line,some just do not.Why Is this so? Reasons may range from skin tone,texture and toughness which one is congenitally born with.However,years of use of cosmetic and beauty products which possess skin lightening properties such as mercury and hydroquinone can weaken and undermine the strength and tensility of the belly muscle.So to all the young ladies out there,its time to scale back on the creams and lotion to get the different experience which most women wish for.You can still have that sexy tummy after birthing your baby.