The third trimester is the home stretch — weeks 28 through delivery — and it tends to feel very different from the breezy middle months. Your baby is gaining weight rapidly, your body is doing the heavy work of preparation, and your to-do list has a new urgency: the hospital bag, the birth plan, the pediatrician, the car seat. This guide covers what your body is doing, what your baby is doing, and how to prepare — practically and calmly — for labor and delivery.
What Changes in the Third Trimester
By week 28, your baby is roughly the size of an eggplant; by week 40, the size of a small pumpkin. That growth is the headline of the third trimester, and you’ll feel it everywhere: in your ribs, your bladder, your back, and your sleep. Common third trimester symptoms include shortness of breath (your uterus is pressing up against your diaphragm), more frequent urination (it’s pressing down on your bladder), swelling in the feet and ankles, trouble finding a comfortable sleeping position, and Braxton Hicks contractions — those irregular “practice” tightenings that come and go.
Energy often dips again in these final weeks. That’s normal. Your body is working extraordinarily hard, and rest is productive now — not laziness. Give yourself permission to slow down.
Your Baby’s Final Preparations
Inside, the finishing work is remarkable. The brain is developing rapidly — forming the connections that will support learning after birth. The lungs are maturing through the final weeks (one reason “every week counts” if delivery timing is ever discussed). Your baby is gaining roughly half a pound a week in the final month, mostly as fat that will help regulate body temperature after birth.
Most babies settle into a head-down position sometime between weeks 32 and 36. Your provider will check positioning at your visits. If your baby is breech (bottom or feet down) as you approach term, your provider will discuss options with you — there are techniques that can encourage turning, and plenty of time in many cases.
Your Checkup Schedule Picks Up
Prenatal visits become more frequent in the third trimester: typically every two weeks from week 28 to 36, then weekly until delivery. These visits aren’t just routine — your provider is now actively monitoring for signs of preeclampsia (blood pressure and urine protein checks), tracking your baby’s growth and position, and, later on, checking your cervix for signs of readiness.
Around weeks 35–37, you’ll likely have a Group B strep screening — a quick, painless swab. Group B strep is a common bacterium that’s usually harmless to you but can affect newborns, so if you test positive, you’ll receive antibiotics during labor. It’s standard, simple, and nothing to worry about.
Come to these appointments with questions. “What should I watch for this week?” and “At what point should I call you versus head to the hospital?” are always worth asking. Our full walkthrough of prenatal checkups and tests covers what each visit typically involves.
The Third Trimester Checklist: Getting Ready
Practical preparation in the third trimester does two things: it makes the logistics of labor day smoother, and it genuinely reduces anxiety. Here’s what to work through, ideally by week 36.
Pack your hospital bag
Pack for yourself, your partner, and the baby — and keep the bag by the door or in the car from week 36 onward. For you: ID and insurance information, a phone charger with a long cable, comfortable labor-friendly clothing, toiletries, nursing-friendly pajamas, and going-home clothes (maternity-sized — you’ll still have a bump). For your partner: snacks, a change of clothes, and anything that helps them support you. For the baby: a going-home outfit, a warm blanket, and the properly installed car seat (more on that below). Skip the valuables, the full makeup kit, and anything you can’t afford to lose.
Install the car seat
This one surprises people with how fiddly it is. Install your infant car seat well before your due date and have the installation checked — many fire stations, hospitals, and baby stores offer free car seat safety checks. A large share of seats are installed incorrectly on the first try, so a professional check is worth the trip. Practice buckling the harness snugly: you shouldn’t be able to pinch slack in the straps at the shoulder.
Choose a pediatrician
Your baby’s first checkup usually happens within a few days of birth, so line up a pediatrician before delivery. Ask about their philosophy, after-hours availability, and how they handle common newborn concerns. A brief prenatal meet-and-greet visit is common and a good way to see if the fit feels right.
Write your birth plan
A birth plan is a one-page summary of your preferences — not a contract, and not a script. Cover your labor environment (lighting, music, movement), pain relief preferences, delivery preferences, and newborn care wishes (like immediate skin-to-skin). Keep it concise and flexible, and review it with your provider ahead of time. Our guide to creating a birth plan walks through each section.
Handle the paperwork and logistics
Pre-register at your hospital or birth center if that’s an option — it saves frantic form-filling during labor. Know the route and where to park. Arrange who’ll care for older children or pets. Stock the freezer with a few easy meals, because the first weeks home are not the time to discover you have nothing to eat. And if you’re employed, finalize your leave paperwork now, not later.
Take a childbirth class (if you haven’t)
Even a single-day intensive class can demystify labor: what contractions feel like, breathing and coping techniques, what interventions exist and why they’re offered. Partners consistently say classes help them feel useful rather than helpless on the day.
The best third trimester preparation is a mix of logistics and mindset: pack the bag and install the car seat, but also make peace with the fact that labor rarely follows a script. A flexible plan plus a provider you trust is the strongest preparation there is.
Nesting, Rest, and the Emotional Stretch
The famous “nesting instinct” — the sudden urge to reorganize every closet at 2 a.m. — is real for many people in the third trimester. Channel it into genuinely useful prep (the nursery, the freezer stash), but don’t let it become a second job. Equally common is a wave of emotion: excitement tangled with anxiety, impatience, or even grief for the life that’s changing. All of it is normal.
Sleep is the hardest part for many. Between bathroom trips, heartburn, leg cramps, and a mind racing through to-do lists, uninterrupted nights are rare. Sleep on your side (left is often recommended for circulation, but either side is fine), use pillows generously — between the knees, under the bump — and rest when you can during the day. This is also a good moment to revisit what you learned in the second trimester about pacing yourself: the finish line is near, but you’re not there yet.
Signs Labor May Be Approaching
In the final weeks, your body starts rehearsing. You might notice your baby “dropping” lower (lightening — easier breathing, more bladder pressure), increased vaginal discharge, the loss of your mucus plug, or more frequent Braxton Hicks. None of these mean labor starts today — they can precede labor by days or weeks.
The real signals are covered in detail in our guide to the signs of labor: regular contractions that get closer together, longer, and stronger; your water breaking; or significant bloody show. When in doubt about whether it’s time, call your provider or the hospital’s labor line — they’d much rather talk you through a false alarm than have you labor at home too long.
When to Call Your Provider Right Away
- Regular contractions before 37 weeks, fluid leaking, or vaginal bleeding
- Severe headache, vision changes, or sudden swelling of face/hands (possible preeclampsia)
- Decreased fetal movement — if your baby’s usual pattern changes noticeably, call promptly; don’t wait to “see if it picks up”
- Severe abdominal pain, fever, or signs of infection
- Your water breaking, even without contractions
Frequently Asked Questions
What should I pack in my hospital bag?
The essentials: ID and insurance info, a long phone charger, comfortable clothes for labor and after, toiletries, nursing-friendly sleepwear, going-home clothes (maternity size), plus a going-home outfit and blanket for the baby and an installed car seat. Add snacks and a change of clothes for your partner. Leave valuables at home.
How do I prepare for labor?
Combine practical prep (hospital bag packed by week 36, car seat installed and checked, pediatrician chosen, birth plan written, hospital pre-registration done) with mental prep (a childbirth class, coping techniques, and a flexible mindset). Knowing the signs of labor and when to call your provider completes the picture.
What are signs labor is approaching?
Possible pre-labor signs include the baby dropping lower, increased discharge, losing the mucus plug, and more frequent Braxton Hicks — but these can happen days or weeks beforehand. True labor signs are regular strengthening contractions, water breaking, or significant bloody show.
How often are checkups in the third trimester?
Typically every two weeks from week 28 to 36, then weekly until you deliver. These visits monitor your blood pressure, urine protein, the baby’s growth and position, and (near term) cervical changes.
When should the car seat be installed?
Well before your due date — aim for week 36 at the latest. Have the installation checked by a certified technician (many hospitals and fire stations offer free checks), since first-time installations are frequently not quite right.
This article is for general information and isn’t a substitute for professional medical advice. Always follow your own provider’s guidance about your pregnancy, labor, and delivery.