Congratulations — 20 weeks marks the official halfway point of pregnancy. You’ve made it through the first trimester’s toughest symptoms, and you’re not yet into the physical demands of the third. This week is best known for one big event: the anatomy scan. Here’s what’s happening for you and your baby.
Your Baby at 20 Weeks
Your baby is about the size of a banana, roughly 6.5 inches from head to bottom and weighing around 10 ounces. Development is accelerating in some fascinating ways:
Hearing is developing — your baby can hear your voice, and may respond to sounds and music
Taste buds and a sucking reflex are functioning — thumb-sucking is sometimes caught on ultrasound
Swallowing practice — your baby swallows small amounts of amniotic fluid daily, helping the digestive system prepare for life outside the womb
Vernix caseosa, a creamy white coating, forms on the skin to protect it from prolonged exposure to amniotic fluid
Bone marrow is beginning to produce red blood cells
Reproductive organs are forming — in female fetuses, the uterus and ovaries (already containing millions of eggs) are in place; in male fetuses, the testicles have started descending
Despite all this progress, your baby still has a lot of developing left to do — 20 weeks is the midpoint, not the finish line.
The 20-Week Anatomy Scan
This week’s headline event is the detailed anatomy ultrasound, sometimes called the anomaly scan or Level 2 ultrasound, typically performed between 18 and 22 weeks. It’s one of the most comprehensive scans of the entire pregnancy. The technician will examine:
The brain, heart, kidneys, bladder, and stomach
The spine, arms, and legs
Fingers and toes
Placenta position and amniotic fluid levels
Overall growth measurements
This scan can also detect signs of certain congenital conditions, including heart defects. In most cases, it’s also when you can find out your baby’s sex, if you want to know — just be sure to tell the technician your preference ahead of time.
Common Symptoms at 20 Weeks Pregnant
Many people describe this stage as a “sweet spot,” with energy returning and morning sickness largely behind them. Still, new symptoms tend to appear as the belly grows:
Stronger, clearer fetal movement — kicks and rolls become easier to feel and recognize
Back pain and round ligament pain, as the growing uterus stretches its supporting ligaments
Heartburn and indigestion, since pregnancy hormones relax the muscles that normally keep stomach acid down
Constipation
Leg cramps
Increased appetite
The “pregnancy glow” many people notice by this stage, thanks to increased blood volume and hormonal shifts
Your Body at 20 Weeks Pregnant
Your bump is likely visibly rounder now, and your provider will probably start measuring fundal height (the distance from your pubic bone to the top of your uterus) at appointments from here on. Average weight gain by 20 weeks is often around 10 pounds, though this varies — the number itself matters less than eating a balanced diet and staying active.
Feeling Your Baby Move
If you haven’t felt quickening yet, 20 weeks is a common time for those first flutters to become more distinct and recognizable as actual baby movements rather than gas or digestion. Some people, especially those who’ve been pregnant before, may have felt movement a few weeks earlier.
When to Call Your Doctor
Reach out to your provider if you notice heavy bleeding, severe abdominal pain, a significant decrease in fetal movement (once you’re regularly feeling it), fluid leakage, or signs of preterm labor like regular contractions before 37 weeks.
Tips for Week 20
Snap a halfway bump photo if you’re into documenting the journey
Start thinking about the basics — sleep setup, feeding plans, car seat — there’s still plenty of time
Keep up with iron and other prenatal nutrients as your blood volume continues expanding
Eat smaller, more frequent meals if heartburn is an issue
FAQ
How big is a baby at 20 weeks pregnant?
About the size of a banana — roughly 6.5 inches long and 10 ounces, measured head to bottom (crown to rump).
What happens at the 20-week anatomy scan?
It’s a detailed ultrasound checking your baby’s brain, heart, spine, organs, and limbs, along with placenta position and amniotic fluid levels. It can also often reveal the baby’s sex.
Is 20 weeks really halfway through pregnancy?
Yes — a full-term pregnancy is about 40 weeks, so 20 weeks marks the midpoint, even though it falls near the end of the fifth month.
Why do I have heartburn at 20 weeks pregnant?
Pregnancy hormones relax the muscles that normally keep stomach acid in place, which can lead to reflux. Eating smaller meals and avoiding spicy or greasy food can help.
Should I feel the baby moving every day at 20 weeks?
Movement is often still irregular at 20 weeks and tends to become more consistent over the following weeks. If you’ve been feeling regular movement and it suddenly changes, contact your provider.
