Bigger buttocks after pregnancy may be caused by dietary factors and changes in hormone levels. 1. Dietary factors: the increase in diet after pregnancy leads to an increase in body weight, and the fat in the buttocks will relatively increase, thus causing a large buttocks after pregnancy. 2. Changes in hormone levels: After pregnancy, due to hormonal reasons, sodium and water retention in the body, there will be lower limb edema and other conditions. Some pregnant women have significant swelling, which can lead to the phenomenon of large buttocks after pregnancy. Post-pregnancy buttocks will gradually return to normal after delivery, you can usually do more activities, pay attention to balanced nutrition, reasonable weight gain, to help alleviate the situation of the buttocks become bigger.