Intrauterine growth restriction (IUGR) affects 3-10% of pregnancies, and occurs when a growing fetus is smaller than it should be. There are multiple causes. There are two types of IUGR: one where all internal organs are reduced in size (also referred to as small for gestational age), and another where the head and brain are normal in size but the abdomen is smaller. IUGR may be caused by poor nutrition during pregnancy, maternal weight under 100 lbs, chromosomal abnormalities, or problems with the placenta (the organ that delivers nutrients and oxygen to the fetus). IUGR can be diagnosed by an ultrasound once the doctor confirms the baby's due date. Sometimes an amniocentesis (collection of cells shed by the fetus) will be performed to check for genetic abnormalities. IUGR babies may have problems with low blood sugar, lack of oxygen, increased red blood cell count, or neurological disabilities at birth. Treatment for IUGR typically depends on how far along in pregnancy the condition is diagnosed, and may include a change in habit or diet for the mother. At birth, the baby's treatment will depend on what symptoms he or she exhibits.