Hair loss after having a baby is mainly caused by three factors: First, affected by the hormonal changes in the body, women’s body estrogen levels are higher when they are pregnant, and estrogen can prolong the growth period of hair, slow down the rate of hair loss, so that a large number of hair follicles in the extended late growth period without entering the resting phase. After giving birth to a baby the estrogen level in the body decreases and falls back to the normal level, the pores enter the resting period at the same time, leading to an increase in the amount of hair loss in the months after childbirth. Second, the mental factors, some women after the birth of a newborn child under too much pressure, sleep deprivation, will also cause the body’s endocrine disorders induced hair loss. Third, the factors of diet, lactation, maternal malabsorption or diet is too single, resulting in the maternal inhalation of nutrient deficiencies and nutritional hair loss.