* Weight gain: Pregnancy usually leads to weight gain, and some of that weight can be distributed to the butt and thighs.
* Fluid retention: During pregnancy, the body retains more fluid, which can contribute to a fuller appearance.
* Hormonal changes: Hormones like relaxin can loosen ligaments and joints, including those in the pelvic area, which can affect the shape and size of the butt.
* Fat storage: The body stores fat in preparation for breastfeeding, and some of that fat may be stored in the butt.