Week 25 of Pregnancy
Learn about your baby's development and what to expect at 25 weeks pregnant.
Baby's Size This Week
Baby Development at Week 25
- ● At week 25, your baby is approximately 34.6 cm and weighs around 660g.
- ● The lungs are continuing to develop surfactant, and capillaries are forming within the lungs in preparation for the first breath at birth.
- ● Your baby has distinct sleep and wake cycles and is becoming more active — kicks and rolls are strong enough to be felt by others placing a hand on your abdomen.
- ● The nostrils, which have been closed until now, are beginning to open, and your baby may start practicing breathing movements using amniotic fluid.
- ● Brain development accelerates this week, with the cerebral cortex becoming increasingly folded and complex to increase surface area.
- ● The hands are fully formed and your baby frequently touches their face, grasps the umbilical cord, and explores the womb environment.
Your Body at Week 25
- ● At week 25, your growing belly may cause backaches and round ligament pain as the uterus continues to expand rapidly.
- ● Braxton Hicks contractions (mild, irregular practice contractions) are common and typically feel like a tightening or hardening of the abdomen.
- ● Heartburn and indigestion remain common; try propping your head and shoulders up with pillows while sleeping.
- ● Increased blood volume can cause nasal congestion and occasional nosebleeds — use saline spray and a humidifier for relief.
- ● You may notice your gums are more tender or prone to bleeding (pregnancy gingivitis) due to hormonal changes affecting blood flow to the gums.
- ● Sleeping may become more difficult as the belly grows; try a pregnancy pillow and sleep on your left side to optimize blood flow to the baby.
Week 25 Checklist
- ☐ Schedule your glucose challenge test (GCT) between weeks 24–28 if not already done.
- ☐ Attend all scheduled prenatal appointments — your provider will check fundal height, blood pressure, and baby's heartbeat.
- ☐ Begin planning the nursery: choose furniture, research safe sleep guidelines (firm flat surface, no loose bedding), and prepare the space.
- ☐ Register for a prenatal breastfeeding class or lactation consultation to prepare for feeding after birth.
- ☐ Research cord blood banking and make a decision — collection must be arranged before your due date.
- ☐ Focus on adequate iron, calcium, and omega-3 intake in your diet to support the baby's rapid brain and bone development.
Frequently Asked Questions
What should I expect at 25 weeks pregnant?
At 25 weeks pregnant, you are in the second trimester. Your baby is about the size of a Rutabaga (34.6 cm) and is rapidly developing lung tissue, brain complexity, and motor activity. You should be feeling regular, strong fetal movement. Common symptoms include backache, heartburn, nasal congestion, and Braxton Hicks contractions. Always consult your healthcare provider for personalized guidance.
How big is my baby at 25 weeks?
At week 25, your baby is approximately 34.6 cm in length and weighs around 660g — roughly the size of a Rutabaga. These measurements are averages based on WHO fetal growth charts; individual babies vary naturally in size.
When should I start kick counting?
Many providers recommend beginning daily kick counts around 28 weeks, but you can begin tracking patterns of movement now. A common method is the Cardiff Count-to-Ten: note how long it takes to feel 10 movements. If it consistently takes longer than 2 hours, or if movement noticeably decreases, contact your provider.
Why do I have nosebleeds during pregnancy?
Increased blood volume during pregnancy — up to 50% more than pre-pregnancy — puts added pressure on the delicate blood vessels in the nose, making them more prone to rupture. Hormonal changes also cause the nasal lining to swell. To prevent nosebleeds, use a saline nasal spray, stay hydrated, and run a humidifier at night.
Is it safe to sleep on my back at 25 weeks?
By the mid-second trimester, sleeping on your back can compress the inferior vena cava — the large vein that returns blood to your heart — which may reduce blood flow to the baby. Most providers recommend sleeping on your left side from around 20 weeks onward. A pregnancy pillow can make side sleeping more comfortable and sustainable.
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.