When: The first few days after delivery
Why: In the days that follow giving birth, while your uterus shrinks back to prepregnancy size (a process that can take up to six months), you'll experience cramps that can range from mild to contraction-like. These cramps can be exacerbated by breastfeeding, which stimulates the release of oxytocin, the hormone that causes contractions. Ibuprofen, massage, or a heating pad can help ease the pain, Dr. Sole says.