According to Shape, breastfeeding can burn between 380 to 600 calories per day. The body burns approximately 20 calories to produce 1 ounce of milk, and a baby eats 19 to 30 ounces per day.
Shape explains that one of the health benefits of breastfeeding is the rapid loss of the pregnancy belly. Breastfeeding releases hormones that cause the uterus to shrink. Another health benefit of breastfeeding is its ability to fight cancer. Some studies show that women who breastfeed for a long period of time decrease their risk of breast or ovarian cancer. The risk of getting heart disease and Type 2 diabetes also decrease with breastfeeding.