Pregnancy Week 13 vs Week 27
Complete comparison of baby development, mom's symptoms, and changes between these weeks
📊
Time Difference
14 weeks apart
🔄
Trimester
Crossing from 1st to 2nd trimester
Baby Size Comparison
Growth Progress
Week 13Peapod
Week 27Cauliflower
Your baby is approximately 50% through pregnancy
Week 13
📏
Length
2.9 inches
⚖️
Weight
0.81 ounces
🍎
Size Comparison
Peapod
Week 27
📏
Length
14.4 inches
⚖️
Weight
2 pounds
🍎
Size Comparison
Cauliflower
What Changes Between Week 13 and 27?
👶New Baby Developments
- ✓Baby can recognize and respond to your voice, your partner's voice, and familiar sounds
- ✓Lungs continue maturing but still aren't fully ready for breathing air
- ✓Baby has established regular sleep and wake cycles that may not match yours
- ✓Brain is highly active with waves that can be measured on EEG
- ✓Hands are active - baby grasps umbilical cord, touches face, and sucks thumb
🤰New or Changing Symptoms
- ✓Preparing physically and mentally for third trimester
- ✓Possible sciatic nerve pain shooting down legs from baby's position
- ✓Increased Braxton Hicks contractions
- ✓Possible swelling in hands, feet, and face
- ✓Trouble sleeping and frequent nighttime urination
📈Key Changes Summary
Baby Growth: Your baby continues to grow rapidly, with organs developing and maturing each day.
Your Body: Your body adapts to support your growing baby with various physical and hormonal changes.
Baby Development Milestones
Week 13 Development
- •Unique fingerprints are forming on tiny fingertips
- •Eyes are moving closer together from the sides of the head to the front of the face
- •Baby can suck their thumb and has developed the sucking reflex
- •Ovaries (with 2 million eggs) or testes are fully developed internally
- •Vocal cords are complete and fully formed
- •Intestines finish moving from umbilical cord into abdomen
Week 27 Development
- •Baby can recognize and respond to your voice, your partner's voice, and familiar sounds
- •Lungs continue maturing but still aren't fully ready for breathing air
- •Baby has established regular sleep and wake cycles that may not match yours
- •Brain is highly active with waves that can be measured on EEG
- •Hands are active - baby grasps umbilical cord, touches face, and sucks thumb
- •Baby can open and close eyes now
Common Symptoms
Week 13 Symptoms
- •Energy levels increase significantly as you enter the second trimester
- •Morning sickness usually subsides or disappears completely for most women
- •Baby bump becomes more visible and noticeable to others
- •Round ligament pain may increase as ligaments stretch rapidly
- •Sex drive may return as energy improves and nausea fades
- •Continued breast growth and possible leaking of colostrum
Week 27 Symptoms
- •Preparing physically and mentally for third trimester
- •Possible sciatic nerve pain shooting down legs from baby's position
- •Increased Braxton Hicks contractions
- •Possible swelling in hands, feet, and face
- •Trouble sleeping and frequent nighttime urination
- •Possible anxiety about upcoming labor and delivery
Nutrition Tips
Week 13 Nutrition
- •Continue balanced nutrition with a variety of colorful fruits and vegetables
- •Eat at least 5 servings of fruits and vegetables daily for vitamins, minerals, and fiber
- •Include healthy fats from avocados, nuts, seeds, olive oil, and fatty fish for brain development
- •Stay hydrated with 10-12 glasses of water daily
- •Increase protein intake to support rapid fetal growth
- •Include foods rich in DHA (salmon, sardines, walnuts) for brain and eye development
Week 27 Nutrition
- •Continue balanced nutrition with variety of whole foods
- •Eat foods rich in vitamin K like leafy greens for blood clotting
- •Include healthy fats like avocados, nuts, and olive oil for brain development
- •Stay hydrated with 10-12 glasses of water daily
- •Include DHA-rich foods for final brain development surge
- •Eat small frequent meals to maintain energy
⚕️When to Contact Your Healthcare Provider
During weeks 13 to 27, contact your healthcare provider if you experience:
- •Severe abdominal pain or cramping
- •Heavy bleeding or passing clots
- •Severe headache with vision changes
- •Persistent fever over 100.4°F (38°C)
- •Sudden swelling of hands, face, or feet
- •Decreased fetal movement