The Anatomy Scan Is Behind You
If you had your anatomy scan last week or the week before, you may still be processing it. Some women feel immediate peace after a normal scan result. Others find that the relief fades quickly and is replaced by a different kind of worry, a shift from "is the anatomy normal?" to "are they moving enough?" to whatever the next question is.
That cycle is not a sign that something is wrong with you. It's a normal feature of caring deeply about something you have no real control over. Pregnancy is a long practice in sitting with uncertainty, and many women find that the anatomy scan felt like the last "big" safety check, with a quiet "what now?" on the other side.
Week 21 is a good week to lean into the good news and let it land.
Your Baby This Week
Your fetus is now about the size of a carrot, measuring roughly 10.5 inches (26.7 cm) from head to heel and weighing about 12 ounces [1]. From this point forward, length is typically measured head-to-heel, because the legs are now long enough to be significant.
- Taste buds are fully formed. Your baby has a complete set of taste receptor cells, and the flavors present in the amniotic fluid, which reflect your diet, are already influencing flavor preferences. Research suggests that exposure to varied flavors in utero may increase acceptance of those flavors in infancy [3].
- Bone marrow is taking over blood production. Until now, the liver was the primary site of red blood cell production. By week 21, the bone marrow is beginning to take over this role, which will become its permanent function [2].
- Movements are stronger and more frequent. What were subtle flutters a few weeks ago are now clearly kicks and rolls for most women. Your baby is active for roughly 30 to 40 percent of the day, though you won't feel all of that activity [1].
- Eyebrows and eyelashes have formed. Fine, downy eyebrows and lashes are now visible on the face [2].
After the Anatomy Scan: What to Do With What You Learned
Even a completely normal anatomy scan can leave unanswered questions. Here are the most common things women wonder about after the fact:
"The sonographer said something about a soft marker. What does that mean?" Soft markers are anatomical variations, such as a slightly bright bowel or a small choroid plexus cyst, that on their own are usually insignificant but may prompt additional consideration alongside other risk factors [4]. If you were told about a soft marker and are unclear on the significance, call your provider to ask directly.
"The placenta was low. Should I be worried?" Many placentas that appear low at 18 to 22 weeks will migrate upward as the uterus grows. Your provider will re-check placental position at a later scan, typically around 32 weeks, before making any management decisions.
"I found out the sex and I'm not feeling what I expected to feel." Gender disappointment is real. It is not a character flaw. It is a response to the mental image of your baby shifting. Almost universally, it resolves as the pregnancy progresses and the real baby becomes more present. If it persists or deepens into distress, bring it up with your provider.
"Everything was normal. Why do I still feel anxious?" Because the anatomy scan checked structural development at one point in time. It cannot check for everything. The worry that remains after a normal scan is not irrational; it's the residual alertness of protecting someone you already love.
Your Body at Twenty-One Weeks
- Heartburn arrives (or intensifies). Progesterone relaxes the lower esophageal sphincter, allowing stomach acid to reflux upward. Small, frequent meals, avoiding lying down within two hours of eating, and raising the head of your bed slightly can all help. Speak with your provider before starting any antacid medication [5].
- Stretch marks may appear. As the skin stretches across the abdomen, breasts, and hips, the collagen and elastin fibers can tear, forming striae (stretch marks). Genetics play the dominant role in whether you develop them. Moisturizing helps with the itch but does not prevent the marks themselves.
- Navel changes. As the uterus pushes outward, an "innie" navel may begin to flatten or even pop out. This is harmless and temporary.
What MomDoc Wants You to Know
Your next routine prenatal visit is typically around week 24. That appointment will check fundal height, listen to fetal heart tones, review blood pressure and weight, and discuss any questions you've accumulated. Start writing them down now, because the list grows faster than you expect.
You are more than halfway through. The anatomy scan, for most families, is a turning point where pregnancy begins to feel more settled. Your carrot-sized baby with the fully formed taste buds has already learned something about the flavors of your kitchen. They are paying more attention than you might think.