The monthly back pain may be postpartum hormonal effects, improper breastfeeding posture, rectus abdominis muscle separation caused by the action can be remedied by reducing the bending of the waist, do the correct breastfeeding posture, to avoid prolonged standing sedentary and other ways. 1. Reduce the action of bending: when changing diapers, it is best to put the baby to the height of their own not bending to change, hold the baby when the knees are bent, keep the waist straight, hold the baby when the thighs are hard to get up, relying on the pelvic floor muscles and abdominal strength to stand up, and do not bend over as much as possible at any other time. 2. Do the correct breastfeeding posture: side or bend over to breastfeed the baby, will make the lumbar muscles are always in a state of tension, resulting in lumbar muscle strain and back pain, it is recommended to use the side position posture, the waist can be a cushion for support, the mother will feel more comfortable. 3. Avoid standing and sitting for a long time: avoid standing for long periods of time, sitting on soft sofas and sleeping on soft beds, which may increase the loading on the waist and make it easy for lumbar pain to recur. If the back pain is serious, consult your doctor for details.