There are many reasons that can cause low back pain after delivery: first of all, carrying a baby can cause low back pain because the whole body weight is pressed on the waist when carrying a baby, so the patient will experience increased load on the waist and thus pain. In addition, improper breastfeeding posture can also lead to back pain. Finally, after childbirth, there will be some sequelae and the pelvic ligaments will become more relaxed, which will also cause back pain. Patients can change the posture of holding the baby, and change the breastfeeding posture to avoid increasing the load on the lumbar spine, and the symptoms of low back pain will be relieved. If the low back pain is caused by lax pelvic ligaments, the symptoms will be relieved by lying down and resting and using a pelvic girdle.