Intrauterine Growth Restriction: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Intrauterine Growth Restriction?
An obstetrician (a doctor who cares for pregnant women) usually leads care for intrauterine growth restriction, often with a maternal-fetal medicine specialist (a doctor for high-risk pregnancies). After birth, a neonatologist (a newborn doctor) or a pediatrician may care for the baby. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is intrauterine growth restriction?
Intrauterine growth restriction (IUGR) is also called fetal growth restriction. It means a baby is not reaching its full growth potential in the womb. Doctors diagnose it when an ultrasound shows the baby's estimated weight or belly size is below the 10th percentile, smaller than most babies at the same stage of pregnancy.
Not every small baby has IUGR. Some babies are small but healthy and have reached their growth potential. If the mother is small, it may be normal for her baby to be small.
Symptoms
A pregnant woman may feel that her baby is not as big as it should be. Her uterus may also measure small. The measurement runs from the pubic bone to the top of the uterus. It is called the uterine fundal height.
Depending on the cause, the baby may be small all over. Or the baby's head may be normal size while the rest of the body is small.
IUGR raises the chance of problems for the baby, such as:
- A higher risk that the baby will die inside the womb before birth.
- More stress on the baby during labor or a cesarean section (C-section) delivery.
- After birth, trouble feeding, jaundice (yellow skin), and unstable blood sugar and body temperature.
As these children grow, they are at risk of abnormal growth patterns and later heart, metabolic, and development problems.
Causes and who gets it
Placenta and umbilical cord problems are the most common causes. The placenta is the organ that gives the baby oxygen and food. A baby may also get too little because the mother lives at high altitude. Twins or triplets can do this too. So can preeclampsia or eclampsia, which are dangerous high blood pressure problems in pregnancy.
Birth defects and chromosome problems can also cause it. So can infections during pregnancy, such as cytomegalovirus, rubella, syphilis, and toxoplasmosis.
Health problems in the mother can add to the risk. They include:
- High blood pressure, heart disease, or kidney disease.
- Diabetes or thyroid disease.
- Anemia (low red blood cells) or clotting disorders.
- Poor nutrition.
- Alcohol use, smoking, or illicit drug use.
How doctors diagnose it
Your provider may suspect IUGR if your uterus measures small. A formal ultrasound is the standard way to diagnose it. This test uses sound waves to make pictures of the baby. More tests may be needed to look for infection or genetic problems.
Treatment
Care for IUGR is mostly close watching. If your provider thinks you might have IUGR, you will be monitored closely. This includes regular ultrasounds to measure the baby's growth, movements, blood flow, and the fluid around the baby. A nonstress test is also done. It listens to the baby's heart rate for 20 to 30 minutes.
Doctors suggest seeing a maternal-fetal medicine specialist after a diagnosis. Depending on the results, your baby may need to be delivered early. The timing balances the risks of premature birth and of staying in the womb. The baby's heart is monitored all the time during labor.
After birth, children who had IUGR should have their weight, length, and head size checked. This can be done at regular well-child visits.
When to see a doctor
Contact your provider right away if you are pregnant and your baby is moving less than usual. After birth, contact your provider if your infant or child does not seem to be growing or developing normally.
Call 911 or go to the emergency room if you have bleeding that will not stop, severe belly pain, trouble breathing, chest pain, or fainting.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Before pregnancy, such a doctor can help manage long-term health conditions and review your medicines. During pregnancy, they can coordinate care with your obstetrician.
Common questions
Does a small baby always mean IUGR?
No. Some babies are small but healthy and have reached their growth potential. If the mother is small, it may be normal for her baby to be small.
Does IUGR mean my baby will be born early?
Not always. Depending on test results, your baby may need to be delivered early. The timing balances the risks of premature birth and of staying in the womb, and a maternal-fetal medicine specialist can help decide.
Can IUGR be prevented?
No. Experts say no proven measure prevents it, and bed rest, diet changes, and vitamin supplements do not lower the chance. Doctors still advise healthy steps. Do not drink alcohol, smoke, or use drugs. Eat healthy foods and get regular prenatal care.
Can IUGR affect a child after birth?
Yes, it can. Newborns may have trouble feeding, jaundice, and unstable blood sugar and body temperature. Later, these children are at risk of abnormal growth and of heart and development problems.
Sources
- MedlinePlus - Intrauterine growth restriction
- American Academy of Family Physicians - Fetal Growth Restriction Before and After Birth
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
