![]() ![]() You have a miscarriage or an ectopic pregnancy. ![]() You get hit in the belly during pregnancy.Your baby’s in a breech position (feet-down instead of head-down) before labor and your provider tries to rotate (move) him around so he’s head-down.These are prenatal tests that your health care provider may recommend during pregnancy. You have an amniocentesis (also called amnio) or chorionic villus sampling (also called CVS).Your baby’s blood crosses into your blood through the placenta.The placenta grows in your uterus (womb) and supplies your baby with food and oxygen through the umbilical cord.Įven though you and your baby don’t share blood, a small amount of your baby’s blood can mix with yours during pregnancy. If they do mix, your body makes Rh antibodies that may go from your body through the placenta into your baby’s body, where they attack and destroy her red blood cells. This means your blood and your baby’s blood are incompatible, so it’s not safe for them to mix together. Rh disease (also called Rh incompatibility) happens when your blood is Rh-negative and your baby’s blood is Rh-positive. Anemia is when a person doesn’t have enough healthy red blood cells to carry oxygen to the rest of the body. Rh disease is a dangerous kind of anemia. Genes are parts of your body's cells that store instructions for the way your body grows and works. This means Rh factor is passed from parents to children through genes. If you’re Rh-negative, your partner can get tested to find out his Rh type. Most people in the United States are Rh-positive. You can find out if you’re Rh-positive or negative with a blood test. ![]() But it can affect your baby during pregnancy if you’re Rh-negative and your baby is Rh-positive. Being Rh-positive or Rh-negative doesn’t affect your health. If your red blood cells don’t have the protein, you’re Rh-negative. If your red blood cells have the protein, you’re Rh-positive. Rh factor is a protein that’s found on some people’s red blood cells. ![]()
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