Blood Types in Pregnancy A baby may have the blood type and Rh factor of either parent, or a combination of both parents. Hemolytic Disease of the Newborn This condition occurs when an incompatibility exists between the blood types of the mother and baby. Vitamin K Deficiency Bleeding (Hemorrhagic Disease of the Newborn) Hemorrhagic disease of the newborn is a bleeding problem that occurs during the first few days of life. Hydrops Fetalis This is a life-threatening problem of severe swelling in the fetus and newborn. It develops when too much fluid leaves the bloodstream and goes into the tissues. Hyperbilirubinemia and Jaundice A newborn with this condition has too much bilirubin in the blood. Bilirubin causes a yellowing of the baby's skin and tissues. This is called jaundice. Hypocalcemia A baby with this condition has too little calcium in the blood. Hypocalcemia is more common in premature and low birthweight babies. Hypoglycemia in the Newborn Babies who are more likely to develop hypoglycemia include those born to women who have diabetes. Overview of Blood and Blood Components Human blood consists of about 22 percent solids and 78 percent water. The components of blood are plasma, fat globules, chemicals, and gases. Polycythemia Mild polycythemia may not cause problems, but too many red blood cells can increase the blood volume or thicken the blood, making it harder to circulate through the blood system and to the organs. Thrombocytopenia Thrombocytopenia is a condition in which a baby has too few platelets—the blood cells needed for clotting.