Second Trimester
Week 23: Baby crosses the threshold of viability — can potentially survive outside womb.
Here's everything happening with your baby and your body this week.
Your baby is the size of a
Grapefruit
💡 Expert tip
Sleep on your side with a pregnancy pillow between your knees — it takes pressure off the vena cava and reduces back pain.
🌱 Baby's development this week
- Viability milestone — lung development accelerating
- Skin less translucent as fat deposits grow
- Baby responds to loud sounds with a jump
- Pancreas developing steadily
Science fact
The viability threshold — when a baby can survive outside the womb — has shifted from 28 weeks (1960s) to 22–23 weeks today, thanks to NICU advances. Survival rates at 23 weeks are now 30–50%.
🤰 Your symptoms this week
Shortness of breath when active
uterus pressing up on diaphragm
Normal as uterus grows. Sleep propped up, avoid lying flat. Sudden severe breathlessness: seek care.
Difficulty sleeping comfortably
pregnancy pillow between knees and under bump helps
Heartburn after meals
eat smaller portions and avoid spicy, fatty foods
Eat smaller meals, avoid lying down after eating, skip spicy/fatty foods. Antacids (Tums) are safe.
💛 Changes in your body
- Uterus now 1.5 inches above belly button
- Swelling in feet and ankles is common and normal
- Glucose screening (GD test) coming up at 24–28 weeks
- Sleep may be difficult with bump and kicks
💙 Mental health this week
The viability milestone can paradoxically increase anxiety for some women. If intrusive thoughts about baby
🥗 Nutrition focus
- Protein intake critical as baby gains 100g/week from here — aim for 80–100g/day
- Zinc supports fetal immune development — beef, chickpeas, pumpkin seeds
- Avoid eating a large meal within 2 hours of bedtime — reduces heartburn and improves sleep quality
📅 Appointment / test
Glucose tolerance test (gestational diabetes screening) is coming at 24–28 weeks — prepare by eating normally beforehand.
✅ This week's checklist
✓
Buy a quality pregnancy pillow if you haven