The first thing to rule out is the existence of back diseases, such as lumbar disc protrusion or lumbar strain, etc. If not, it does not matter. After pregnancy, as the pregnancy week gradually increases, the uterus and the fetus grows, the center of gravity of the pregnant woman will change, causing the lumbar vertebrae to tilt, resulting in lumbar soreness and swelling, especially in late pregnancy, many pregnant women will walk with their hands on the waist. It is best to wear flat shoes to help find a good balance. Calcium, iron and zinc supplements should be started in the fourth month of pregnancy. Since the baby needs calcium for bone development, if the supplement is not enough, it will absorb the pregnant mother’s and may aggravate the back pain, so it is very important to take calcium supplements routinely, which can also avoid the soreness and swelling of the back after delivery. It is recommended to take blood tests for vitamin D levels, if the vitamin D is low it will also affect the absorption of calcium, and usually more sunshine is good for the baby’s growth and development. It is recommended to eat more high quality protein foods and drink a glass of warm skimmed milk every day before going to bed. 4 months later, fetal movement gradually appears, but it is not yet very regular. In short, the symptoms of back discomfort after pregnancy are very common, pay attention to control the weight of the baby, too much weight may aggravate the back soreness and pain.