Ultrasounds are a standard and reassuring part of prenatal care, giving you a window into your developing baby. If you are wondering how many ultrasounds you will need over the course of a healthy pregnancy, the answer depends on several factors. This guide explains what ultrasounds check for, how many a typical pregnancy includes, and what might lead your provider to recommend more.
What is an ultrasound, and how does it work?
A prenatal ultrasound is a medical imaging technique that uses sound waves to create pictures of your uterus and baby. A handheld device called a transducer sends high-frequency sound waves that bounce off internal structures, creating echoes. Those echoes are converted into real-time images on a screen, allowing your provider to observe the organs, tissues, and your baby's development. The exam is painless and considered safe when performed for medical reasons.
What an ultrasound checks for
Ultrasounds play a central role in monitoring the health of both you and your baby. During pregnancy, they can:
- Confirm pregnancy. An early scan can visualize the gestational sac and, a little later, the embryo and heartbeat.
- Determine gestational age. Accurate dating helps establish your due date and track development.
- Monitor fetal growth. Repeat scans can confirm your baby is growing at a healthy rate.
- Check for birth defects. A detailed anatomy scan can identify structural differences, helping you and your care team prepare.
- Assess the placenta. Imaging can evaluate the placenta's health and position.
- Evaluate amniotic fluid. Scans can measure fluid levels to ensure they are in a healthy range.
So, how many ultrasounds will I need?
For most healthy, low-risk pregnancies, two to three scans are typical:
- Early pregnancy ultrasound: Often performed between about weeks six and nine, this scan confirms the pregnancy, estimates gestational age, and checks for the baby's heartbeat.
- Anatomy scan: Around 18 to 20 weeks, this detailed scan assesses your baby's growth, screens for abnormalities, and evaluates the placenta and amniotic fluid.
- Third-trimester ultrasound: Not always needed, but recommended when there are specific concerns — for example, to track growth, check fluid levels, or confirm your baby's position.
Your provider will tailor the schedule to your individual pregnancy.
What can change the number of ultrasounds
Several factors may lead to additional scans:
- Pregnancy complications. Conditions such as gestational diabetes, preeclampsia, or suspected growth restriction often call for closer monitoring.
- Risk level. Low-risk pregnancies generally involve fewer ultrasounds, while high-risk pregnancies may need more frequent imaging.
- Medical history. Previous complications or certain health conditions can influence the recommended number of visits.
- Multiples. Expecting twins, triplets, or more usually means more ultrasounds to monitor each baby.
- Personal reasons. Some parents request extra imaging for reassurance, though you may need to pay out of pocket for scans that are not considered medically necessary.
When to seek care
Between scheduled scans, contact your provider promptly if you notice:
- A decrease in your baby's movements in the later stages of pregnancy
- Vaginal bleeding or fluid leakage
- Severe or persistent abdominal or pelvic pain
- Severe headaches, vision changes, or sudden swelling, which can be signs of preeclampsia
- Any symptom that worries you
It is always okay to call and ask whether you should be seen or imaged sooner.
Frequently asked questions
Are ultrasounds safe? Prenatal ultrasounds are considered safe when performed for medical purposes by trained professionals.
Is two or three ultrasounds really enough? For most healthy pregnancies, yes. Your provider will recommend more only if there is a specific reason.
Will insurance cover extra scans? Medically necessary scans are typically covered, but elective imaging for reassurance may be out of pocket. Check with your insurer.
Talk with Anna Health
From your first ultrasound through postpartum care, our team is here to support you at every step. Learn more about our gynecology and obstetrics care, or contact us to schedule a visit. You can also call (703) 642-7522 to book an appointment and receive care tailored to you.
