Bone marrow aplasia is the cessation of the production of blood cells which are normally made at the heart of the bone marrow. The bone marrow no longer produces any, or very little, red and white blood cells, and platelets. Bone marrow aplasia is a rare disease which mainly appears during infancy. Patients with bone marrow aplasia may feel fatigued, be subject to bleeding, and have an increased vulnerability to infection. A bone marrow transplant or an immunosuppressant therapy are possible treatments for bone marrow aplasia.