Diastasis recti is the separation of the rectus abdominis muscle, commonly affecting pregnant or postpartum women, particularly those with multiple pregnancies. Symptoms include a visible abdominal bulge, weakness in the core, and pelvic pain, while risk factors include age and the size of the baby. Prevention and management focus on maintaining healthy weight gain, practicing proper posture, and engaging in specific core exercises while avoiding activities that increase abdominal pressure.