There is no authoritative information to show how long the black line on the stomach can go down after giving birth. Most women’s black line on the stomach can subside 3 to 12 months after giving birth, but a small number of women’s black line on the top of the stomach may never go down. After pregnancy, estrogen and progesterone levels will change, and melanin deposits will appear on the stomach, which is a normal physiological phenomenon, so the black lines on the stomach will generally subside after the hormone levels in the female body return to normal. Most women will gradually lose the dark lines on their stomachs 3 to 6 months after giving birth. However, in some cases, the black line on the stomach will disappear more slowly, and it may take 6 to 12 months for the black line to subside or disappear. In addition, a small number of women will have a permanent dark line on their tummy that will not go away after giving birth. How long it takes for the black line to go down after giving birth needs to be judged according to the woman’s physical condition, and it is recommended that women should keep the skin on the stomach clean, and eat protein-rich food such as pig’s trotters, chicken claws, milk, and fish in their diets.