TL;DR
- Your baby is about 14.2 cm — the size of a bell pepper.
- Baby may start to hear your voice and other sounds.
- Your anatomy scan is coming up in the next few weeks.
- You might be feeling more baby movement as your little one grows stronger.
Your Baby This Week
At 14.2 cm, your baby is the size of a bell pepper — and the world just got a lot more interesting for them. This week, the tiny bones in your baby's ears are developed enough that hearing is beginning. Your baby may start to respond to sounds — your heartbeat, the rush of blood through your vessels, the rumble of your stomach, and even your voice.
This is a beautiful moment in your pregnancy. Your baby is beginning to experience the world, starting with the most constant sound there is: you.
The nervous system is maturing rapidly, and myelin — a protective coating — is starting to form around the nerves. This insulation allows nerve signals to travel faster and more efficiently, which means your baby's movements are becoming better coordinated and more purposeful.
If your baby is a girl, the uterus and fallopian tubes are now in place. If a boy, the genitals may be visible on an ultrasound. Your baby's digestive system is also working — meconium, the dark, tar-like substance that will be baby's first bowel movement after birth, is beginning to accumulate in the intestines.
Your Body This Week
Your anatomy scan is approaching — typically scheduled between weeks 18 and 22 — and it's one of the most anticipated appointments of pregnancy. This detailed ultrasound checks your baby's organs, brain, spine, heart, limbs, and overall growth. It's also when many parents find out the sex, if they choose to.
You might be feeling baby movements more consistently now, especially if this isn't your first pregnancy. Those gentle flutters from a couple of weeks ago might be getting a bit stronger — more like little pokes or taps.
Your cardiovascular system is working harder than ever. Blood volume has increased by about 40-50% compared to pre-pregnancy, and your heart is pumping more blood with each beat. This is completely normal but might make you feel lightheaded if you stand up too quickly.
Leg cramps, particularly at night, are common around this time. The exact cause isn't fully understood, but staying hydrated, stretching your calves before bed, and making sure you're getting enough magnesium and calcium can help.
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Common Questions at Week 18
What happens during the anatomy scan?
The anatomy scan is a detailed ultrasound that typically lasts 30-45 minutes. The technician will measure your baby's head, abdomen, and thigh bone, check the heart's four chambers, examine the brain and spine, look at the kidneys, and check the placenta and amniotic fluid levels. You'll likely get to see your baby on screen in real time.
What if the anatomy scan finds something?
Most anatomy scans come back completely normal. If something looks unusual, your provider will explain what they see and discuss next steps, which might include additional testing or monitoring. Finding something on the scan doesn't automatically mean something is wrong — sometimes they just need a closer look.
Why are my feet swelling?
Mild swelling (edema) in the feet and ankles is common during pregnancy, especially as blood volume increases and your growing uterus puts pressure on veins. Elevating your feet, staying active, and drinking plenty of water can help. Talk to your provider if swelling is sudden, severe, or accompanied by headaches or vision changes.
This Week's Tip
Your anatomy scan is coming up — and it's one of the most exciting moments of pregnancy. If you want to find out your baby's sex, let the technician know at the start of the appointment. If you want to keep it a surprise, say so clearly before the scan begins. Consider bringing your partner or a support person — seeing your baby in detail on the screen is a moment many parents want to share. Some practices offer photos or even video clips, so ask ahead of time.
Sources
- American College of Obstetricians and Gynecologists (ACOG). How Your Fetus Grows During Pregnancy.
- Mayo Clinic. Fetal Development: The 2nd Trimester.
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