Your Changing Body See All  Anatomy: Fetus in Utero in Your Changing Body Definitions of terms related to the anatomy of a fetus in utero....more  Hormones During Pregnancy in Your Changing Body Many hormone levels are affected in the body during pregnancy, with several hormones playing major roles. ...more  Weight Gain During Pregnancy in Your Changing Body Average weight gain for women is between 25 and 35 pounds, although slight deviations from this may also be considered normal.

Diabetes See All  Diabetes During Pregnancy in Diabetes Diabetes is a condition in which the body can't make enough insulin, or can't use insulin normally. Insulin is a hormone. It helps sugar (glucose) in the blood get into cells of the body to be used as fuel. When glucose can’t enter the cells, it builds up in the blood. This is called high blood sugar (hyperglycemia). ...more  Gestational Diabetes in Diabetes Gestational diabetes is a type of diabetes that happens during pregnancy. The symptoms of gestational diabetes usually go away after delivery.

Digestive and Liver Disorders See All  Hyperemesis Gravidarum in Digestive and Liver Disorders Many pregnant women have some nausea and sometimes vomiting in the first trimester. A few pregnant women have a severe kind of nausea and vomiting called hyperemesis gravidarum. Read on to learn more about this condition. ...more  Cholestasis of Pregnancy in Digestive and Liver Disorders Cholestasis of pregnancy is a liver problem.

Fetal Growth Problems See All  Fetal Growth Restriction in Fetal Growth Problems Fetal growth restriction is a condition in which an unborn baby is smaller than expected for the number of weeks of pregnancy (gestational age). ...more  Very Low Birth Weight in Fetal Growth Problems Very low birth weight is a term used to describe babies who are born weighing less than 3 pounds, 4 ounces. It is very rare that babies are born this tiny. Only about 1 in 100 babies born in the U.S. are very low birth weight.

Infections in Pregnancy See All  Maternal and Fetal Infections in Infections in Pregnancy In pregnancy, infections are a common complication—but women may not have obvious symptoms, or they may show different symptoms of an infection....more  Group B Streptococcus Infection in Babies in Infections in Pregnancy Group B streptococcus (strep) is a type of bacteria. It can be found in the digestive tract, urinary tract, and genital area of adults. About 1 in 4 pregnant women carry GBS in their rectum or vagina. During pregnancy, the mother can pass the infection to the baby.

Pregnancy Loss See All  Overview of Pregnancy Loss in Pregnancy Loss Pregnancy loss is the death of an unborn baby (fetus) at any time during pregnancy. Pregnancy loss may occur in as many as 1 in every 4 pregnancies. Most pregnancy losses happen during the first trimester. ...more  Miscarriage in Pregnancy Loss Miscarriage is a pregnancy loss in the first 20 weeks of pregnancy. About 10% to 20% of pregnancies end in miscarriage, most often in the first trimester (first 13 weeks of pregnancy). Read on to learn more.

Nervous System Disorders See All  Migraine Headaches During Pregnancy in Nervous System Disorders Many women have migraine headaches while pregnant. The good news is that you don't have to give in to the pain when it strikes. Know what pain-relief options are safest for you. ...more  Epilepsy During Pregnancy in Nervous System Disorders Epilepsy is a disorder of the nervous system. It is also called a seizure disorder. Normally the body's nerves send information by electrical and chemical signals. People with epilepsy have abnormal electrical signals in the brain.

Other Complications See All  Hydramnios in Other Complications In this condition, there is too much amniotic fluid around your baby during pregnancy. It happens in about 1 in 100 pregnancies. ...more  Anemia in Pregnancy in Other Complications Anemia is when your blood has too few red blood cells. Having too few red blood cells makes it harder for your blood to carry oxygen or iron. This can affect how cells work in nerves and muscles. During pregnancy, your baby also needs your blood.

Preterm Labor See All  Preterm Labor in Preterm Labor Preterm labor is labor that starts before 37 completed weeks of pregnancy. Labor is when the uterus regularly tightens and the cervix starts to thin and open. This lets the baby (fetus) enter the birth canal. ...more  Preterm Premature Rupture of Membranes (PPROM) in Preterm Labor Preterm premature rupture of the membranes (PPROM) is a pregnancy complication. In this condition, the sac (amniotic membrane) surrounding your baby breaks (ruptures) before week 37 of pregnancy.

Thyroid Disorders See All  Graves Disease in a Newborn (Neonatal Graves Disease) in Thyroid Disorders Graves disease is an autoimmune disease. The immune system normally protects the body from germs with chemicals called antibodies. But with an autoimmune disease, it makes antibodies that attack the body’s own tissues. With Graves disease, antibodies cause the thyroid gland to make too much thyroid hormone. This is known as hyperthyroidism. Extra thyroid hormone in the bloodstream leads to the body's metabolism being too active.