23 Weeks Pregnant
second trimester · Month 6
17 Weeks to Go!
Baby is as long as a grapefruit
Key Takeaways
- Hearing fully functional — recognizes voices, music
- Lungs developing surfactant (will breathe air at birth)
- Skin wrinkled, translucent; baby looks like a tiny elderly person
23 Weeks Pregnant
Baby’s Development
Your baby now measures about 28.9 centimeters — roughly the size of a grapefruit — and weighs around 501 grams [1]. This is the week many consider the edge of viability: with advanced NICU care, survival at 23 weeks is roughly 25 to 30 percent, climbing to 50 to 70 percent at 24 to 25 weeks. Your baby’s hearing is now fully functional and can recognize voices, music, and loud noises, often responding with a startle. Inside the chest, the lungs are beginning to produce surfactant, the remarkable substance that keeps the air sacs from collapsing once your baby takes that first breath. The brain is busy forming rapid new synapses, and the skin is still wrinkled and translucent — giving your baby a sweet, almost “elderly” look. Lanugo continues to cover the body, and fingernails have formed. Movement is lively with kicks, rolls, and somersaults, and your baby now has distinct sleep-wake cycles of about 20 to 30 minutes each. The age of viability has arrived [2].
Pregnancy Symptoms
Your energy is probably still holding, though it may begin to wane. The familiar symptoms may be settling in — backache, heartburn, constipation, leg cramps, mild swelling, headaches, and Braxton Hicks contractions. Your uterus now sits about 3 to 4 centimeters above your navel, and the kicks are distinct enough that your partner can feel them from the outside. You may also feel round ligament pain, sciatica, or pelvic pain from symphysis pubis dysfunction. Some swelling in your feet and ankles is normal, and your resting heart rate runs around 80 to 100 beats per minute. Reaching viability can surface some anxiety, and that’s completely understandable — talk it through with your provider [2].
Body Changes
Your uterus has risen about 3 to 4 centimeters above your navel, and most women have gained between 15 and 22 pounds by week 23. Your bump is clearly visible now. You may notice stretch marks, the linea nigra, melasma, more visible veins, or varicose veins. Your breasts may be up about two cup sizes, and a little colostrum may leak. The “pregnancy mask” of melasma can appear on your face, your skin may be oilier with occasional breakouts, and you might even develop a few skin tags [2].
Tips for Week 23
- Acknowledge viability anxiety — it’s normal to feel scared. Talking with your OB about realistic outcomes, touring the NICU if it would help, and learning what’s available can ease the fear, since knowledge tends to reduce it.
- Get familiar with the NICU — if you want to prepare, touring the NICU at your planned hospital can help. Premature birth is uncommon (about 10 percent of US births), but understanding the system brings peace of mind.
- Strengthen and stabilize — focus on your glutes, core (especially the transverse abdominis), and back. Pelvic tilts, glute bridges, modified side planks, and bird-dogs can reduce back pain and support your growing belly.
- Update your skincare — keep using a pregnancy-safe moisturizer, apply SPF 30 or higher daily to protect against melasma, and a vitamin C serum is fine. Avoid hydroquinone and retinoids.
Things To Do (Checklist)
- Address viability anxiety: talk to OB, tour NICU if helpful
- Continue strength + core work (glutes, back, transverse abs)
- Update skincare: SPF 30+ daily, no retinoids
- Document “viability” milestone
- Schedule glucose screening (24-28 weeks)
Frequently Asked Questions
Q: What does “viability” mean? A: Viability is the gestational age at which a baby has a reasonable chance of surviving outside the womb, with the help of advanced NICU care — generally around 23 to 24 weeks. Survival rates rise steadily: about 25 to 30 percent at 23 weeks, 50 to 70 percent at 24 weeks, 70 to 80 percent at 25 weeks, and over 90 percent from 26 weeks on [1].
Q: I’m anxious about preterm birth. How common is it? A: About 10 percent of births in the US are preterm (before 37 weeks), and most of those are late preterm (34 to 36 weeks) with excellent outcomes. Warning signs include regular contractions, bleeding, leaking fluid, or severe back pain [2].
Q: Can I start kick counts now? A: At 23 weeks it’s still a bit early for formal kick counts; most providers begin at 28 weeks, looking for 10 movements within 2 hours. For now, just get to know your baby’s patterns [1].
For Dads
- Process viability as a couple — your partner may feel fear, and you might too. Don’t minimize it. Talk about it together, and tour the NICU if it helps. Prematurity is rare, but the possibility is real.
- Update the “go-bag” list — you don’t need to pack yet, but decide what you’re bringing, what your partner is bringing, and what the baby will need. A shared doc works well.
- Cook for third-trimester prep — think ahead to postpartum: freezer meals, easy snacks, and a hydration setup. Pre-batching 5 to 10 meals now will save you both later.
- Read The Expectant Father, Chapter 20 — it covers the emotional reality of the shift from the second to the third trimester.
- Pray for lung development — surfactant production is critical for that first breath. Be specific and intentional this week.
Sources
- ACOG — How Your Fetus Grows During Pregnancy
- Mayo Clinic — 23 Weeks Pregnant
- What to Expect When You’re Expecting — Heidi Murkoff (Chapters 14-15: Second Trimester)
Sources
- guideline ACOG — How Your Fetus Grows During Pregnancy
- medical Mayo Clinic — 23 Weeks Pregnant
- book What to Expect When You're Expecting — Heidi Murkoff
Your Checklist
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Action Plan Items for Week 23
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