Exploring week 18: What’s happening with baby and your changing body

An illustration of a uterus and a fetus the size of a bell pepper representing 18 weeks pregnant.
  • Updated Dec 2, 2024
  • Published

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Created with Hector Chapa, MD, FACOG, Clinical Assistant Professor of Obstetrics and Gynecology, USA

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In a nutshell

At 18 weeks pregnant, your baby is developing more defined movements, and you may start feeling light kicks. Your belly is expanding, and new symptoms like backaches or leg cramps might appear as your body adjusts.

At 18 weeks pregnant, you’re almost halfway through your pregnancy, and exciting changes are happening for both you and your baby! As your baby’s muscles and bones strengthen, you may begin to feel light flutters or kicks, especially if this isn’t your first pregnancy. Your body is also adapting with a growing belly and possibly some new symptoms, making it the perfect time to focus on self-care and preparing for the upcoming months. Here’s what to expect in week 18, from baby development to health tips and more.

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18-week pregnancy symptoms

As you progress further into the second trimester, some new symptoms may arise as your body continues to adapt to your growing baby. Here are common symptoms at 18 weeks:

  • Feeling baby movements: Many women start to feel light flutters or kicks around this time, though it may take longer for first-time moms.
  • Backaches: As your belly grows, you may experience mild back pain due to the added pressure on your spine.
  • Leg cramps: Some women experience leg cramps, often at night, due to increased weight and changes in circulation.
  • Increased appetite: With your baby growing quickly, your body’s nutritional demands may lead to a noticeable increase in hunger.
  • Nasal congestion: Pregnancy rhinitis, or nasal congestion, can persist as blood flow increases, making nasal passages feel swollen.

👉Find out more: 17 weeks pregnant: Baby’s growth, position & belly changes

Your body at 18 weeks pregnant

By week 18, your uterus is expanding, and it may be close to your belly button. This shift, along with increased weight, can lead to changes in posture, back discomfort, and even mild balance issues. It’s crucial to check your weight gain during pregnancy to ensure that you’re supporting your baby’s growth and adjusting to the changes in your body. Your growing belly may start to affect your center of gravity, so it’s essential to wear supportive shoes and be mindful of movements. With your baby moving more actively, some women feel those first gentle kicks, a wonderful milestone that connects you even more closely to your little one.

18-week pregnant belly

At 18 weeks, many women have a noticeable bump as the uterus continues to expand upward. Your belly may feel rounder and firmer, and you may find that maternity clothes or looser-fitting clothing are now more comfortable.

Baby development at 18 weeks pregnancy

At 18 weeks, your baby’s bones are continuing to harden, and muscles are strengthening, enabling more defined movements. The baby’s hearing is also developing, and they can detect sounds, including your voice. Vernix, a protective coating, is starting to form on their skin, helping to protect it as they float in amniotic fluid. The nervous system is maturing, allowing for more coordinated movements, which you may start to feel as flutters or kicks.

18-week baby size

The 18-week fetus size is approximately 5.5 inches long and weighs about 7 ounces, similar to the size of a bell pepper. The baby’s body and limbs are more proportionate, and movements are becoming stronger.

18-week ultrasound

An 18-week ultrasound can provide a clearer look at your baby’s growth and development. During an 18-week ultrasound 4D scan, you may even see more detailed images of the baby’s facial features and body movements, like stretching or turning. For those interested, this is also a common time to check the baby’s gender, as genitals are now visible on an ultrasound.

Where is my baby at 18 weeks in my stomach?

At 18 weeks, your baby is positioned low in the abdomen, with the uterus expanding toward the belly button. As your pregnancy progresses, the uterus will gradually shift upward, allowing more space for the baby to grow.

Tests to expect at 18 weeks of pregnancy

  • Detailed anatomy ultrasound (Level 2): Conducted between 18-22 weeks, this comprehensive ultrasound examines the baby’s organs, limbs, and facial features, and can often reveal the baby’s sex.
  • Blood screening as needed: Regular checkups may include additional blood work to monitor iron levels and overall health.

👉Find out more: 

Week 19 of pregnancy: What’s happening with your baby and bump

Halfway there: Insights on being 20 weeks pregnant and fetal development

Health tips and self-care at 18 weeks pregnant

  • Focus on hydration: Staying hydrated can help with circulation, reduce leg cramps, and manage pregnancy-related congestion.
  • Practice good posture: As your belly grows, maintain good posture to alleviate back pain. You may also benefit from using a support band for added comfort.
  • Include magnesium-rich foods: Foods like nuts, leafy greens, and whole grains can help reduce leg cramps and support muscle health.
  • Get enough rest: As your baby’s movements increase, consider using pillows for extra support at night, especially under your belly and between your legs.
Take control of your pregnancy journey!

Track your symptoms with Femia and get tailored

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Questions from the Femia community

  • Is it normal to experience leg cramps?

    Yes, leg cramps are common due to increased weight and circulation changes. Staying hydrated, stretching, and including magnesium-rich foods can help reduce cramps. Using a pregnancy app can help you track new symptoms like backaches or leg cramps as your body adjusts to this exciting phase.

  • When will I start feeling more regular baby movements?

    Many women start feeling consistent movements between 18 and 22 weeks, though this can vary. If it’s your first pregnancy, it may take a bit longer to recognize these movements.

  • Can I still sleep on my back?

    It’s best to transition to sleeping on your side, especially after the second trimester, to improve blood flow. Use pillows for support to make side sleeping more comfortable.

The bottom line

At 18 weeks pregnant, your baby is growing fast, practicing movements, and starting to detect sounds. You may notice an increase in belly size, and appetite, and possibly feel the first gentle kicks. Focus on staying hydrated, practicing good posture, and enjoying the increased energy that often comes with the second trimester.

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