Week 24 is a medical milestone: viability. If your baby were born today, modern medicine would give them a fighting chance—about 40-70% survival rates with intensive intervention. No one wants to thin...
The Quick Brief
Week 24 is a medical milestone: viability. If your baby were born today, modern medicine would give them a fighting chance—about 40-70% survival rates with intensive intervention. No one wants to think about that, but crossing this threshold brings a profound shift in how both of you may feel about this pregnancy.
What's Happening with Baby
Your baby is now about the size of an ear of corn (12 inches long, 1.3 pounds). The big news this week is the lungs—they're beginning to produce surfactant, a substance that keeps the tiny air sacs in the lungs from collapsing. This is the single most critical factor in viability. Without surfactant, breathing outside the womb isn't possible.
The brain continues rapid development, forming the grooves and folds that characterize the human brain's structure. Taste buds are fully formed, and studies suggest babies develop preferences for flavors present in amniotic fluid (which is affected by mom's diet). The skin is still thin but is transitioning from translucent to opaque.
Your baby's face is almost fully formed—the same face you'll see at birth. Fat stores are beginning to accumulate, which will help regulate body temperature after birth. The inner ear is fully developed, so balance and orientation are online. They can tell if mom is upside down.
The startle reflex (Moro reflex) is now present—a sudden noise or sensation can cause the baby to throw out their arms and legs, then curl back up. Your partner may feel these startle responses.
What's Happening with Mom
The uterus is now about the size of a soccer ball and sits about 2 inches above the belly button. This week often brings the glucose tolerance test, which screens for gestational diabetes. She'll drink a very sweet beverage and have blood drawn an hour later to measure blood sugar response. Gestational diabetes affects about 6-9% of pregnancies and is manageable when caught.
Physical symptoms are intensifying. The growing uterus presses on the stomach (hello, heartburn), bladder (frequent urination returns), and diaphragm (shortness of breath). Back pain is common as her posture adjusts to the shifting center of gravity. Round ligament pain—sharp twinges in the lower abdomen when moving quickly—is normal and caused by the ligaments supporting the uterus stretching.
Sleep is becoming more difficult. Finding a comfortable position is challenging, and frequent urination disrupts sleep architecture. The recommendation to sleep on the left side (which optimizes blood flow to the uterus) can be hard to maintain all night.
Many women report that this week brings an emotional shift—the viability milestone makes the pregnancy feel more real and the stakes higher.
What Dad Should Do This Week
1. Schedule the Hospital Tour
Most hospitals and birth centers offer tours for expectant parents. Do this now—available slots fill up, and you want time to process what you learn. On the tour, note: Where do you park? Where do you check in? What's the L&D room like? What are visiting policies? What's the NICU situation if needed? Take the tour even if you're planning a home birth; backup plans matter.
Plan the babymoon NOW. This is the optimal travel window before third-trimester restrictions. Airlines restrict flying after week 36 — some require a doctor’s certificate earlier. One dad booked a trip without checking the airline’s policy and had to cancel at a loss. Research your airline before booking any late-pregnancy travel.
2. Register for Childbirth Classes
Whether you do the hospital's free class, a weekend intensive, or a specific method (Lamaze, Bradley, hypnobirthing), register now. Classes are typically taken around weeks 28-32, and popular options book up. Even if you think you know what to expect, these classes give your partner practice with coping techniques and give you tools to be an active support person.
3. Start the Birth Plan Conversation
Not the final plan—just the beginning of the conversation. What matters to her? What's she worried about? What does she know about her pain tolerance? Does she want to try unmedicated or is she asking for the epidural in the parking lot? No judgment either way—but knowing her preferences means you can advocate effectively when she's in labor. Write nothing down yet; just talk.
4. Review Your Work's Parental Leave Policy
If you haven't already, get the specifics in writing. How much time? Paid or unpaid? What's required to request it? Do you need to use PTO first? When do you need to notify HR? Some companies have different policies for birth parents versus non-birth parents. Know exactly what you're entitled to so you can plan.
The Relationship Check-In
Viability week can bring unexpected emotions. For many couples, crossing this threshold surfaces fears that weren't conscious before—or allows them to release anxiety they'd been holding. Neither of you may have acknowledged how much worry you've been carrying.
Travel together as much as you can right now. Once the baby arrives, spontaneity dies. At 7 PM in Italy wanting pizza on a whim? Not happening with a baby. Every outing requires planning around feeding schedules, nap times, diaper bags, and car seats. Enjoy the freedom while you have it.
This week's conversation: "We made it to viability. How are you feeling about that?" Check in about her stress level. Check in about your own. It's okay to feel relief, fear, excitement, or all of them simultaneously. The middle of pregnancy can feel like a waiting room; validating that can help.
What's Coming Up
The third trimester begins at week 28—you're almost there. These next few weeks are final prep time. The nursery should be nearing completion. The glucose test results will come back. Childbirth classes will start. Week 27 often brings a pediatrician search; you'll need one before birth. The pace is about to pick up.