GUIDE
You are officially halfway through your pregnancy — congratulations. The anatomy scan typically happens this week.
At the size of a banana, your baby is swallowing amniotic fluid, and you may get your most detailed look at them yet.
Be prepared from day one
Your baby is about the size of a banana — approximately 6.5 inches from crown to rump (or about 10 inches from head to toe when the legs are extended) and weighing around 10 ounces. You are at the halfway mark.
Your baby is now swallowing several ounces of amniotic fluid every day. This is not just a reflex — it serves real developmental purposes. The swallowed fluid helps mature the digestive tract, provides nutrients, and contributes to the formation of meconium, the dark, sticky substance that will be your baby's first bowel movement after birth.
The skin is becoming less transparent as more layers develop, though it is still quite thin and wrinkled. Vernix caseosa continues to coat the skin, and lanugo — fine, downy hair — covers much of the body. Both will gradually diminish before birth.
If you are having your anatomy scan this week, you will get an incredibly detailed look at your baby. The sonographer will measure everything from the head circumference to the femur length, examine the four chambers of the heart, check the brain structure, count fingers and toes, and evaluate all the major organs. This is also when many parents learn whether they are having a boy or a girl.
Since last week, sensory development continues to advance and your baby's movements are stronger than ever.
Your uterus has reached your belly button — a milestone your provider may note at your appointment. From here, the top of the uterus (called the fundus) will rise about one centimeter per week. Fundal height measurements become a regular part of prenatal checkups from this point forward.
Back pain is one of the most common complaints at 20 weeks, and it tends to intensify as your belly grows. The combination of a shifting center of gravity, loosened ligaments from relaxin, and the weight of your growing uterus puts significant strain on your lower back. Staying active, maintaining good posture, and strengthening your core with prenatal exercises can help manage it.
You may notice mild swelling in your ankles and feet, particularly after a long day of standing or in warm weather. This is caused by increased fluid retention and the pressure of your uterus on the veins that return blood from your legs. Elevating your feet, staying hydrated (counterintuitive but true), and wearing comfortable shoes can help. Sudden or severe swelling, however, should be reported to your provider immediately.
Emotionally, the halfway point can bring a mix of excitement and anxiety. You may feel a stronger connection to your baby now that movements are more regular and the anatomy scan makes them feel more real. It is also normal to feel overwhelmed by how much is ahead. Take it one week at a time.
Every pregnancy is different. The halfway point is a great time to discuss any new or persistent symptoms with your provider.
The anatomy scan makes this one of the most eventful weeks of pregnancy. Here is what else to focus on.
This is one of the most comprehensive prenatal appointments. The sonographer will check your baby's organs, measure growth, evaluate the placenta, and check amniotic fluid. Bring your partner if possible — this is a special one. Ask for photos.
You do not need to have everything figured out, but the second half of pregnancy goes faster than you expect. Start with the basics — where will baby sleep, and what do you absolutely need versus what is nice to have?
Your belly is shifting your center of gravity forward, which naturally pulls your lower back into a deeper curve. Stand tall, tuck your pelvis slightly, and avoid locking your knees. A supportive chair with lumbar support helps if you sit at a desk all day.
Twenty weeks is worth acknowledging. Take a bump photo, have a special dinner, or just take a moment to appreciate what your body has done so far. You are halfway to meeting your baby.
It is not too early to start thinking about your preferences for labor and delivery. Research your options — birthing center, hospital, home birth — and start a conversation with your provider about what to expect.
When in doubt, call your provider. The anatomy scan may reveal findings that require follow-up — your provider will guide you through any next steps.
At 21 weeks, your baby will be the size of a carrot with stronger, more regular movements. Eyebrows and eyelids are fully formed, and bone marrow is starting to make blood cells.
Now that you have crossed the halfway mark, it is a good time to start addressing common second-half-of-pregnancy issues like back pain and weight gain management.
This guide is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider with any questions about your pregnancy.
