Second Trimester 18 weeks pregnant

Pregnancy Week 18 - Baby Yawns & Hiccups

At 18 weeks, your baby is about the size of a sweet potato and can yawn and hiccup. You may be feeling more distinct movements, especially if this is not your first pregnancy. Your baby's nervous system is maturing rapidly, and the myelin sheath is beginning to form around nerves.

Sweet potato
Baby Size
14.2 cm
Length
190 grams
Weight
Week 18
of 42
Baby Development This Week

Your baby can now yawn and hiccup, which you might feel as rhythmic jerking movements. The nervous system is maturing, and myelin (a protective coating) is beginning to form around the nerves. Your baby's ears are now standing out from the sides of the head, and hearing is improving. The bones are continuing to harden, and the pads of the fingers and toes are forming unique patterns that will become fingerprints and toeprints.

Changes in Your Body

If you have not felt your baby move yet, this may be the week. First-time mothers typically feel movements between weeks 18-22. Your blood pressure may be lower than usual, which can cause dizziness when standing up quickly. You might experience leg cramps, especially at night. Your appetite is likely strong, but remember to eat nutritiously rather than for two. The top of your uterus is now about halfway between your pubic bone and belly button.

Common Symptoms at Week 18
Baby movementsDizzinessLeg crampsBackacheIncreased appetiteBleeding gums
Tips for Week 18
  • Do calf stretches before bed to help prevent nighttime leg cramps.
  • Stand up slowly to avoid dizziness from low blood pressure.
  • Eat small, frequent meals with protein and complex carbs.
  • Start doing pelvic floor exercises (Kegels) daily to prepare for delivery.
When to Call Your Doctor

Contact your healthcare provider for severe dizziness, fainting, visual changes, severe headache, or if you have not felt your baby move by week 22.

Frequently Asked Questions — Week 18