Week 23 of Pregnancy
Learn about your baby's development and what to expect at 23 weeks pregnant.
Baby's Size This Week
Baby Development at Week 23
- ● At week 23, your baby is approximately 28.9 cm and weighs around 500g.
- ● The lungs continue producing surfactant, and the air sacs (alveoli) are beginning to form — a critical step for breathing at birth.
- ● Your baby has distinct sleep and wake cycles, typically sleeping 12–14 hours a day, and movement is felt more consistently.
- ● The skin appears wrinkled and translucent because fat deposits have not yet formed underneath; this will change significantly over the coming weeks.
- ● The inner ear is fully developed, making your baby sensitive to sounds, vibrations, and changes in your body position.
- ● Rapid brain growth is occurring, with the cerebellum — the part responsible for movement and coordination — developing especially fast this week.
Your Body at Week 23
- ● At week 23, your growing belly may cause backaches and difficulty finding a comfortable sleeping position — try sleeping on your left side with a pillow between your knees.
- ● Braxton Hicks contractions (mild, irregular practice contractions) may become noticeable; they typically ease with rest or a change in position.
- ● Heartburn and indigestion are common as the growing uterus puts pressure on the stomach — eat smaller, more frequent meals to reduce symptoms.
- ● Leg cramps, particularly at night, may begin due to changes in circulation and increased pressure on blood vessels.
- ● You may notice your belly button starting to flatten or protrude outward as the uterus continues to expand.
- ● Mild swelling in the hands and feet is normal at this stage; sudden or severe swelling warrants a call to your provider.
Week 23 Checklist
- ☐ If you have not yet had your anatomy scan, schedule it promptly — it is ideally performed between 18 and 22 weeks.
- ☐ Begin researching and scheduling your 24–28 week glucose challenge test (GCT) for gestational diabetes screening.
- ☐ Register for a childbirth preparation class — hospital-based, Lamaze, and hypnobirthing options are available.
- ☐ Research cord blood banking: public donation is free, while private banking has ongoing storage costs.
- ☐ Focus on adequate iron intake (27 mg/day during pregnancy) to support the increased blood volume and prevent anemia.
- ☐ Discuss with your partner how responsibilities will shift after the baby arrives and begin planning postpartum support.
Frequently Asked Questions
What should I expect at 23 weeks pregnant?
At 23 weeks pregnant, you are in the second trimester. Your baby is about the size of a Grapefruit (28.9 cm) and is developing lung tissue, brain folds, and sensory responses. You should be feeling regular fetal movement. Common symptoms include backache, heartburn, leg cramps, and mild swelling. Always consult your healthcare provider for personalized guidance.
How big is my baby at 23 weeks?
At week 23, your baby is approximately 28.9 cm in length and weighs around 500g — roughly the size of a Grapefruit. These measurements are averages based on WHO fetal growth charts; individual babies vary naturally in size.
Is fetal movement regular at 23 weeks?
Fetal movement at 23 weeks is increasing but not yet as predictable as it will be in the third trimester. Most women feel kicks and rolls multiple times throughout the day. If you notice a significant decrease in movement, drink something cold, lie on your side, and count kicks. Fewer than 10 movements in 2 hours warrants a call to your provider.
Can my baby survive if born at 23 weeks?
A baby born at 23 weeks is considered periviable — survival is possible with intensive NICU care, but it comes with significant risks of long-term complications. Survival rates increase considerably each week. This is why preventing preterm labor and attending all prenatal appointments is so important during this period.
What causes leg cramps at 23 weeks and how can I relieve them?
Leg cramps during pregnancy are thought to be related to changes in circulation, pressure on leg nerves, and possible low magnesium or calcium levels. To relieve them, stretch the calf by flexing your foot, apply a warm towel, and stay hydrated. Discuss magnesium supplementation with your provider if cramps are frequent or severe.
Track Your Exact Pregnancy Week
Use our free Pregnancy Week Tracker to find out exactly how far along you are based on your last menstrual period or due date.
Track My Pregnancy →Sources
- ACOG
- WHO Fetal Growth Charts
- Mayo Clinic
Medical disclaimer: This content is for informational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider for guidance specific to your pregnancy.