Your baby this week
Your baby now weighs about six and three-quarter pounds and measures roughly nineteen and a half inches — about the size of a bunch of leeks. And the development report this week is beautifully boring: essentially complete. The organs are mature and ready for life outside.
The lungs have their surfactant. The digestive system, while it has never processed a meal, is fully built and standing by — its first real job begins with the first feed, hours after birth. The cosmetic finishing touches are finishing, too.
The lanugo — the fine, downy hair that covered your baby's body for insulation — has mostly shed by now, though some babies arrive with soft patches of it on their shoulders and back, which fade in the first weeks. The vernix, that creamy protective coating, has thinned considerably as well; many babies are born with just traces left in the creases of the neck, arms, and legs. Under the skin, fat continues its quiet work, and your baby's color is shifting from the red of early pregnancy toward the pink-toned skin of a newborn — the exact shade, of course, is a surprise your baby is keeping for the day itself.
Two systems, though, deserve a special mention, because they are emphatically not finished — and that's by design. The brain: your baby's brain will keep growing and wiring at an astonishing pace not just this week, but through the first years of life; birth is a milestone in its development, not the end of it. And the grip: your baby's grasp reflex is now strong and ready — which is how a person one day old will wrap their whole hand around your finger and hold on like they mean it.
Because they do. Movement keeps its familiar pattern — rolls, pushes, stretches, the evening wakefulness you've come to know — and it should stay that way right to the end. Your baby is ready when the day comes, mama. What's left is simply the day coming.
Your body & the waiting game
And you, mama — week 38 is physically heavy and emotionally heavier, and both deserve naming. Physically: the carrying-low pressure, the pelvis that feels fully occupied, back and hip aches that have achieved seniority, and sleep that arrives in short stories rather than novels. Braxton Hicks contractions may now be frequent enough to run several convincing auditions a day — and yes, some evenings will feel like a dress rehearsal that goes nowhere.
That pattern — contractions that start, build a little, and then quietly fade over hours or days before returning — even has a name among midwives: prodromal labor. It is frustrating, it is tiring, and it is real work: your body is, slowly and on its own schedule, preparing the cervix for the main event. Mention it at your visits so your team knows your pattern, and rest through it whenever you can — sleep banked now is spent wisely later.
Emotionally, week 38 has its own weather. The questions have begun — the texts, the calls, the kind neighbor: "Any news? Baby yet?" Everyone means well, and it can still feel like living inside a countdown clock that other people keep checking.
A small kindness to yourself: prepare one cheerful, copy-paste reply — "No news yet! Baby will announce. We'll share the moment there's something to share" — and let it do the work while you conserve your patience for better things.
Irritability, tears, sudden calm, sudden nesting frenzies: all standard-issue week 38. None of it means you're doing the waiting wrong. Waiting, at this altitude, is the job — and you're nearly done with it.
The true labor checklist
Here it is, then — the checklist that turns "is this it?" into a set of observations you can actually make. No single sign below is a guaranteed starting gun on its own; it's the combination and the momentum that speak. Keep this list somewhere findable, and run down it whenever the question rises.
One: contractions with momentum. Real labor contractions settle into a pattern you can time, and over the hours they grow steadily stronger, last longer, and come closer together. Two: they don't switch off.
Resting, walking, changing position, a warm shower — the rehearsal contractions of Braxton Hicks usually fade with these; true labor keeps coming regardless, because it has a job to do. Three: the sensation builds in character — for many women it begins as deep cramping or back pressure that sweeps around to the front, growing in intensity until, during the peak of a contraction, conversation has to pause. When you find yourself unable to chat through them, that is information.
Four: your water breaks — a gush, or a slow continuous trickle you can't stop. It can happen before contractions begin, or well into labor; whenever it happens, it goes on the call list immediately, which we'll cover next. Five: bloody show — mucus tinged with blood as the cervix changes; a small amount with mucus is a classic sign that things are moving.
And six, the background chorus: pelvic pressure increasing, an ache low in the back that doesn't lift, and — reported by many women with a laugh, afterward — a sudden burst of nesting energy or an equally sudden need to be very, very quiet and still. A quick word on timing, since the whole checklist leans on it: a contraction is timed from the start of one to the start of the next for spacing, and from start to finish for length. Apps do this beautifully, and so does a partner with a phone clock.
Time a handful, then put the phone down for a while — you're looking for the trend across an hour, not a perfect spreadsheet. Trust the list, trust the pattern, and above all trust this: when several of these line up and keep building, you no longer need certainty. You need the phone.
When to head in: your doctor's guidance rules
Here is the one rule that outranks every pattern, app, and anecdote in this post: follow your doctor's guidance. Your team knows your history, your baby's position, your distance from the birthplace, and their own unit's routines — and at one of your recent visits, they very likely told you exactly when they want your call. That instruction is your headline.
Everything in this section is written in pencil underneath it. With that said, there are general patterns many doctors commonly mention, and they're worth recognizing. A widely used one goes like this: when contractions are coming about every five minutes, lasting about a minute each, and that rhythm has continued for about an hour, many teams want to hear from you.
Some doctors use different spacing, especially if this isn't your first baby — many will suggest calling earlier, because later labors often move faster than first ones. Others adjust for a long drive, a planned cesarean, a positive GBS result — remember week 35: antibiotics in labor are part of that plan, which is one more reason your team may want an earlier call — or any detail of your personal picture. All of which is the long way of saying: the pattern starts the conversation; your doctor finishes it.
And three standing instructions that need no pattern at all: if your water breaks, call right away, whatever the contractions are doing. If anything on the warning-sign list joins the picture, call right away. And if you are simply unsure — it's 3 a.m., the signs are half-matching, and you need a human voice — call anyway.
That phone line exists for exactly this, and nobody on the other end of it has ever been annoyed by a week-38 mama checking in. While you're in early labor at home and your team has said to wait, the classic guidance is comfort: rest if you can, move if it helps, eat and drink lightly as your doctor has advised, time contractions loosely rather than obsessively, and let your support person carry the checklist. Your only job is the contractions, one at a time. They are, quite literally, bringing your baby to you.