Week 18: The Anatomy Scan Window Begins
This week often marks the start of the window for your detailed anatomy ultrasound, and your baby's ears are now positioned for actual hearing to begin.
Baby's Development
Your baby's ears have moved into their final position, and hearing is starting to develop — your baby may begin responding to loud sounds from outside the womb, like a door slamming or loud music, in the coming weeks.
Myelin, a protective coating around nerves, is starting to form, which will help nerve signals travel efficiently — a process that continues for years after birth.
If you're expecting a girl, her uterus and fallopian tubes are now formed. If expecting a boy, his genitals may be visible on ultrasound, though positioning doesn't always allow a clear view.
Changes in Your Body
The anatomy scan, one of the most anticipated appointments of pregnancy, is often scheduled between 18 and 22 weeks. This detailed ultrasound examines your baby's organs, limbs, spine, and overall development.
Your uterus is now about the size of a cantaloupe, and many women feel their first clear, unmistakable kicks around this time.
Common Symptoms
At 18 weeks, common experiences include:
- More noticeable and frequent fetal movement
- Continued growth of your bump
- Backaches
- Mild swelling
- Vivid dreams (commonly reported, likely linked to hormonal changes and disrupted sleep)
Nutrition This Week
Continue prioritizing iron, calcium, and protein. If you've been struggling with constipation, increasing fiber intake gradually (to avoid excess gas) along with adequate water intake can help significantly.
Safe Exercises
Prenatal yoga classes often specifically address the postural and comfort changes happening around this stage of pregnancy, including hip opening and gentle core support work that's safe for this trimester.
Medical Checklist
This week:
- Confirm your anatomy scan appointment if not already done
- Prepare any questions you want answered during the scan
- Consider whether you want to learn your baby's sex during this appointment
Doctor Visit Guide
The anatomy scan typically takes 30-45 minutes and examines your baby's brain, heart, spine, kidneys, limbs, and other key structures. It's also commonly when parents learn their baby's sex, if they choose to find out.