By the time you reach the halfway point in pregnancy, you’ve probably had a few prenatal visits, heard that sweet heartbeat a few times, and maybe even felt a flutter or two. But the 20-week anatomy scan—sometimes called the mid-pregnancy ultrasound—is a big one.
It’s a moment many parents look forward to and one that brings a mix of emotions: excitement, nervousness, curiosity, and joy. We know this scan is a major milestone, and we’re here to help you understand what it is, what it’s for, and how to prepare.
What is the 20-Week Scan?
The anatomy scan is a detailed ultrasound that typically happens between 19 and 20 weeks of pregnancy. It’s often the longest and most comprehensive ultrasound during pregnancy.
Unlike the earlier first trimester dating scan, which focuses on due dates and early development, this one takes a thorough look at your baby’s organs, limbs, and overall growth—from head to toe. It also checks on your uterus, placenta, amniotic fluid, and cervix to help ensure everything is progressing smoothly.
Think of it as a head-to-toe baby checkup—done with sound waves instead of stethoscopes.
What Does the Anatomy Scan Check for?
During the scan, a trained sonographer or maternal-fetal medicine specialist will use ultrasound to carefully examine baby’s anatomy including:
- Brain and skull
- Heart – including chambers, valves, and rhythm
- Face – checking for cleft lip or other features
- Spine and spinal cord
- Stomach, kidneys, bladder, intestines
- Arms, legs, hands, and feet – counting fingers and toes is part of the fun!
- Umbilical cord – ensuring there are three vessels (two arteries and one vein)
- Genitals – if you’d like to know baby’s sex, this is often the time to find out
Additionally during this scan your body will also be examined for:
- Placenta – location and structure (making sure it’s growing properly, not too low or covering the cervix)
- Amniotic fluid level
- Cervix length – especially important in preventing preterm labor
- Uterine environment – looking for any fibroids or abnormalities
Frequently Asked Questions About the 20 Week Scan
Will I get to see my baby?
Yes! While this scan is primarily diagnostic, many parents find it emotional and memorable, especially if this is the first time you’re seeing your baby’s little face or limbs in such detail.
Some babies are wiggly and active, while others are a bit more camera shy. The technician might gently press or have you shift positions to get a better view. And yes, you’ll likely get some printed images or digital photos to take home—and maybe even a video clip, depending on the facility.
How long does it take?
You’ll want to set aside 45 minutes to an hour for the anatomy scan. If Baby is in a tricky position or if additional views are needed, it could take a bit longer. Sometimes, you may be asked to return in a week or two for a follow-up if something wasn’t clearly visible, especially all the parts of the heart.
Important note: A follow-up doesn’t necessarily mean anything is wrong—babies love to curl up and hide, and we sometimes just need a better angle.
Can my partner come?
Yes! At Northwest Family Clinics, we absolutely encourage support partners to come to this appointment. It’s a special moment to share, and many parents say it helps them both feel more connected to the pregnancy.
If you have other children, you may want to check ahead before bringing them along, as some facilities prefer the environment to be quiet and focused during the scan. But, if it’s allowed, this can often help younger siblings understand better than a new member of the family is about to come along.
Will I find out the sex of the baby?
Yes, if you want to!
The anatomy scan can usually identify the baby’s sex (as long as Baby cooperates with positioning). Just let your technician know ahead of time if you’d like to know, not know, or maybe have it written down for a gender reveal later on.
What if something isn’t normal?
First, know that most 20-week scans are completely normal, or show only minor things that either resolve on their own or don’t require intervention.
But yes, sometimes the scan can pick up markers for genetic conditions or signs of developmental issues. If that happens, you won’t be left wondering. Your doctor will walk you through everything—what it means, what next steps might be, and whether any follow-up testing is needed.
It can feel overwhelming, but you are not alone. We’re here to support you, answer your questions, and connect you with specialists if needed.
How can I prepare for the scan?
- Drink water beforehand: A partially full bladder can help improve image quality, especially if you're earlier than 20 weeks. Your clinic will give you specific instructions.
- Wear comfortable clothing: You may need to roll down your waistband or lift your shirt.
- Eat a light snack before the scan: A bit of juice or a small meal beforehand can help get baby moving.
- Write down your questions: This is a great time to ask about fetal growth, positioning, or anything you’re wondering about.
A Milestone Worth Celebrating
Reaching the 20-week mark is a big deal—you’re halfway there! And this scan is one of those “real” moments where the pregnancy can suddenly feel more tangible and exciting.
You might leave with more pictures for your fridge, reassurance that everything’s on track, or even a name brainstorming session on the way home.
At Northwest Family Clinics, we know every pregnancy is unique. Whether it’s your first baby or your fourth, we’re here to walk beside you—with answers, empathy, and experienced care every step of the way.
Have questions about your upcoming scan or anything else in your pregnancy? Reach out anytime. We’re honored to be part of your journey.
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