Postpartum shoulder width and back thickness may be caused by consuming more high-protein and high-fat food, which can be recovered through physical exercise and dietary adjustment. 1. Physical exercise: You can burn up the fat accumulated in the shoulders and back through walking, running, leg lifting, yoga and other exercises to improve the width of the shoulder muscles and the thickness of the back muscles. 2. Adjusting diet: If you have wide shoulders and thick back after delivery, you should focus on light diet and eat less greasy food. You can consume more high-protein and low-fat food, such as tofu, skimmed milk, chicken, etc. You can also eat more fruits and vegetables rich in dietary fiber, such as cucumbers, eggplants and apples. If you want to do physical exercise or adjust your diet after delivery, it is recommended that you consult a medical professional to avoid adverse consequences.