After the birth of a child, the belly button is very dark, this situation is very common, is a normal phenomenon. After the birth of a child, the belly button may become larger, and the skin folds in the abdomen, and the skin around the belly button becomes significantly darker. This situation is mainly due to the significant changes in the hormone levels in the body of pregnant women during pregnancy, with a decrease in estrogen and a significant increase in progesterone, and this change in hormone levels can lead to pigmentation on the surface of the body skin, especially in the abdomen, neck, armpits and thighs. This change in hormone levels can lead to pigmentation on the surface of the body, especially in the abdomen, neck, armpits and thighs. After the birth of a child, the skin of the abdomen shrinks and folds, so that the skin will appear melanin deposition more obvious, especially around the navel, so it is very normal to have a darkened navel. This situation will slowly recover over time, there is no need to worry too much, usually eat more fresh vegetables and fruits to supplement vitamins, which will help the absorption of skin pigment.