When you lose blood, you also lose iron. To avoid iron deficiency, increase the amount of iron you get through your daily diet. There are a number of foods that are naturally high in iron. They are:  Lentils and pinto or kidney beans Chicken, liver or beef Broccoli or asparagus Okra, parsley and kelp Mustard greens or beet greens Raisins, plums, dried peaches or prune juice Rice bran Blackstrap molasses For normal or mild postpartum bleeding, there is no need for any drugs to be taken as the bleeding will stop naturally after a maximum of six weeks to two months; however, your doctor may suggest or prescribe some iron supplements for you to treat any signs of anemia as a result of the blood loss.  Most over-the-counter supplements are fine, and are absorbed better with an acidic juice like pineapple or orange juice. Ask your doctor or pharmacist for recommendations if you are unsure about which brand to choose. These supplements are usually taken once a day, but it could be more frequent depending on the severity of your anemia. They should be taken after meals to avoid constipation, which can be a common side effect. Some other gastric disturbances may be felt, such as nausea or vomiting. You may also have green-colored stool. If you are experiencing postpartum hemorrhage, you need to seek immediate medical treatment to prevent shock. Treatments may include:  A blood transfusion may be necessary to support vital organs such as the brain, heart, kidneys and liver and to prevent end organ damage. This blood transfusion will try to compensate for the excessive loss of blood.  Oxytocin will be administered through an IV to stimulate uterine contractions and control the bleeding.  Oxytocin acts mainly by stimulating strong uterine contractions by acting on specific receptors located at the lining of the smooth uterus muscles. It also increases the calcium levels in the intracellular space to induce more vasoconstriction.

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Write a summary of the previous text in Vietnamese:
Điều chỉnh chế độ ăn uống. Uống thuốc bổ sung sắt. Điều trị y tế đối với trường hợp băng huyết sau sinh.