The two parallel muscles in the middle of the abdomen are called the rectus abdominis. As the abdomen bulges during pregnancy, it will hold the rectus abdominis apart and the two sides of the rectus abdominis will separate from the midline to the sides. If the rectus abdominis muscle still cannot return to its original normal position six months after delivery, it is called rectus abdominis separation. The way to determine the separation of the rectus abdominis is for the patient to lie flat on his back and do sit-ups, and a deep, longitudinal, depressed groove between the rectus abdominis muscles on both sides can be palpated. The distance between these two muscles is measured, and a distance greater than 2 cm is called a separation of the rectus abdominis muscle. Separation of the rectus abdominis muscle is common in women after pregnancy and can be checked first for the degree of separation. If the separation is mild, you can do exercises to exercise the rectus abdominis muscle, such as flat support, or you can stand with the back of your head, back and hips against the wall at 3 points, and stand for 10 minutes a day. If the rectus abdominis muscle separation is more than three fingers, after the exercise does not improve, you can perform rectus abdominis muscle repositioning surgery, which is divided into open surgery and minimally invasive surgery. In order to avoid separation of the rectus abdominis muscle, the prepared mother should strengthen the core muscles, especially the abdominal wall muscles, before pregnancy in order to strengthen the tone of the abdominal wall muscles, and should also avoid excessive weight gain and huge babies during pregnancy.