Week 23: Viability Approaches
A sobering milestone — and practical nursery progress
Week 23 is one week before the viability milestone — the point at which a baby born prematurely has a realistic chance of survival with intensive medical care. It's a sobering thought, and a good motivator to keep all your preparations on track. On the practical side, this is a great week for nursery assembly.
What's happening this week
The baby weighs about 1.1 pounds and is around 11 inches long. The lungs are developing surfactant, a substance critical for breathing outside the womb. The baby's skin is still translucent and wrinkled — fat stores will fill it out over the coming weeks. Hearing is well-developed; loud noises may cause the baby to startle.
Your checklist
0 of 4 completeIf the crib and dresser have arrived, assemble them this week. Follow the instructions exactly — don't improvise on safety furniture. Anchor the dresser to the wall with anti-tip straps. Test the crib mattress firmness.
If you're using a video monitor, install it now and test it. Mount the camera securely — cords should be out of reach of the crib (strangulation hazard). Test the range from different rooms.
Use fragrance-free, hypoallergenic detergent (Dreft or All Free & Clear). Wash everything that will touch the baby's skin — onesies, swaddles, crib sheets, burp cloths. Newborn skin is sensitive.
Every parent should know infant CPR. The Red Cross and AHA offer classes (in-person and online). Many hospitals include this in their childbirth prep courses. Take a class together before the baby arrives.
Recommended products
Infant CPR Course — Red Cross
Online or in-person infant/child CPR and first aid certification. Takes a few hours. One of the most important things you can do before the baby arrives.
The viability milestone at 24 weeks is a term used in obstetrics to describe the gestational age at which a premature baby has a reasonable chance of survival outside the womb with intensive medical care. At 23 weeks, survival rates are around 30-50% with significant NICU intervention. By 24 weeks, that jumps to around 60-70%. By 28 weeks, it's over 90%.
For dads, this milestone is a reminder that preparation matters. While the vast majority of pregnancies reach full term, having your practical affairs in order — nursery assembled, car seat installed, hospital bag considerations started — reduces stress as you enter the third trimester. This week is also an excellent time to learn infant CPR, one of the most important skills any new parent can have.
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