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Written by

Gina Conley, MS

18 Weeks Pregnant: What to Expect This Week for You & Baby

  • Pregnancy

Table of Contents

Welcome to Week 18 of your pregnancy journey! The second trimester is often called the “honeymoon phase,” but it still comes with its ups and downs. Here, we’ll cover what to expect at 18 weeks pregnant for both you and your baby, along with some personal insights from my own experience as I navigate my fourth pregnancy. 

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What's Happening with Your Baby at 18 Weeks

At 18 weeks, your baby is about the size of a bell pepper or cucumber (depending on which app you reference). Alternatively, some compare it to a Nintendo NES controller for a fun visual! Here’s a glimpse into your baby’s development:

  1. Hearing Development: Baby’s hearing is improving, meaning they can start recognizing your voice. Singing, reading, or talking to your little one can help with early bonding.

  2. Nervous System Growth: The motor portion of baby’s nervous system is developing, leading to more movement. While you may not feel every flip, kick, or jab, your baby is quite active inside.

  3. Lung Development: The bronchioles (small branches in the lungs) are forming, preparing baby to take deep breaths after birth.

If you haven’t already, this is the earliest point where an anatomy scan is offered—a detailed ultrasound that checks baby’s development and can also confirm the sex of the baby. If you prefer to keep it a surprise, let your provider and ultrasound tech know ahead of time!

Changes You Might Experience

As your baby grows, your body continues to adjust. Here are some common experiences during Week 18:

  1. Swelling & Dry Eyes: You may start noticing swelling in your feet and hands due to increased blood volume and fluid retention. A lesser-known pregnancy symptom, dry eyes can make your eyes feel itchy or irritated. Eye drops may help.

  2. Increased Appetite: With first-trimester nausea behind you, you might feel hungrier but find that smaller, more frequent meals are more comfortable than large ones.

  3. Balance & Stability: As your belly grows, your center of gravity shifts, which can make you feel slightly unstable. Take your time when walking or moving to avoid falls.

  4. Blood Pressure Adjustments: Your blood vessels have expanded, and now your blood volume has caught up. If you noticed lower blood pressure in early pregnancy, it may now return to normal or slightly increase.

A simple analogy: Think of your blood vessels as a highway expanding from one lane to four lanes—at first, there aren’t enough cars (blood volume) to fill the space, so traffic (blood pressure) is low. Now, as more cars enter (increased blood volume), traffic starts flowing normally again.

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My Personal Experience in Week 18

It’s week 18 and I’m feeling good overall! A few highlights from this week’s journey:

  • Feeling Baby Move: Baby girl has been kicking, but there’s no real pattern yet, and movements aren’t strong enough to feel externally.

 

  • Exercise Benefits: Staying active with weightlifting and cardio to help develop baby’s nervous system, motor skills, and cognitive function.

 

  • Anatomy Scan: Everything looked great, and baby girl’s sex was confirmed again! A little anxiety before the scan due to past loss, but ultimately, the reassurance from seeing a healthy baby was worth it.

 

  • Home Birth Plan & Backup Care: Officially established backup hospital-based care in case of complications. Feeling good knowing there’s a safety net.

 

  • Baby’s Position: Started the ultrasound in a breech position, but baby flipped head-down during the scan. Not concerned at this stage since baby is still moving a lot.

 

  • Placenta Position: I have a posterior placenta, meaning movements will be easier to feel in the coming weeks. Reassuring, especially compared to a previous pregnancy where an anterior placenta made movements feel more muted.

 

For those who may have a low-lying placenta detected at this stage—don’t panic! Over 95% of cases resolve on their own as the uterus grows.

Conclusion

At 18 weeks, pregnancy can feel more stable and enjoyable, with symptoms like nausea fading and baby’s movements beginning. Keep focusing on staying active, eating well, and listening to your body as you continue this journey.

If you’re looking for more support during your pregnancy, consider exploring our online prenatal fitness programs and childbirth education courses. You can bundle these for additional savings!

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Frequently Asked Questions

What are good signs at 18 weeks pregnant?
At 18 weeks, many of the tougher first-trimester symptoms are usually behind you — nausea tends to fade and your appetite may be returning. You may also start to notice baby's first flutters and kicks, though they often have no real pattern yet. A healthy anatomy scan, offered starting around this week, is another reassuring milestone that checks baby's development in detail. Every pregnancy is a little different, so check in with your provider about what's normal for you.
What should I avoid in week 18 of pregnancy?
There isn't a long list of new restrictions at week 18, but as your belly grows your center of gravity shifts, which can make you feel slightly unstable — so take your time when walking or moving to avoid falls. You may also find that large meals are less comfortable than smaller, more frequent ones as your appetite picks back up. As always, your provider is the best resource for guidance specific to your pregnancy.
Where exactly is the baby located at 18 weeks?
You can get a sense of where baby is through belly mapping — feeling different parts of your belly to identify baby's head (harder and rounder), back (smooth), and limbs (bumpy), and noticing where kicks and hiccups show up. Kicks usually point to baby's limbs, while hiccups tend to happen near baby's back — if you feel hiccups low in your belly, baby's head is likely down. Our belly mapping guide walks you through it step by step, and your provider can confirm baby's position at your appointments.
Where will I feel my baby kick at 18 weeks?
At 18 weeks, baby's movements are often still subtle — you may notice kicks and flips without any real pattern yet, and they usually aren't strong enough to feel from the outside. Where and how much you feel can also depend on your placenta's position: a posterior placenta (attached toward your back) makes movements easier to feel, while an anterior placenta (toward your front) can make them feel more muted. Baby is quite active in there, so movements may show up all over as they flip and wiggle!