Week 33
Your baby is the size of a pineapple
What's happening this week
Your baby is about 17.5 inches from head to toe and weighs approximately 4.5 pounds. Seven weeks until your due date — though your baby could realistically arrive any time in the next 4-9 weeks.
This week, your baby's pupils can change size in response to light — constricting in brightness and dilating in darkness, just as they will after birth. The eyes are continuing to practice the visual processing that will be essential once your baby enters the much brighter world outside the womb.
Bones are hardening throughout the body, with one important exception: the skull. The bones of the skull remain soft and flexible, separated by gaps called fontanelles. This design is intentional — it allows the skull to compress slightly during passage through the birth canal. The fontanelles will gradually close during the first 18 months after birth. You'll be able to feel the soft spots on your newborn's head.
The brain is growing and developing rapidly, adding complexity every day. Your baby is now capable of coordinating basic functions like breathing, sucking, and swallowing — the trio of skills needed for feeding after birth. These functions are practiced regularly using amniotic fluid.
Your baby's immune system continues to receive antibodies from you through the placenta, building a temporary defense system that will protect them in the early months of life. This passive immunity is one of the reasons your provider may recommend certain vaccines during pregnancy — the antibodies you produce in response are shared with your baby.
Fat continues to accumulate, giving your baby an increasingly round and plump appearance. The skin is smooth and pink, losing the wrinkled look of earlier weeks.
Your body this week
Seven weeks to go, and the countdown feels very real. Your body is at peak pregnancy — carrying your heaviest load, managing the most internal pressure, and working harder than it ever has.
You may notice that your baby has 'dropped' or feel that they've shifted lower in your pelvis, especially if this is your first pregnancy. This is called lightening, and it can happen weeks before labor or not until labor begins. If it does happen, you may find it easier to breathe (less pressure on the diaphragm) but harder to walk (more pressure on the pelvis and bladder).
Braxton Hicks contractions are likely a regular occurrence now. They're your uterus's way of practicing for labor. Stay hydrated and change positions when they happen. If they become regular and progressively stronger, time them and call your provider.
Your provider may discuss the Group B Strep (GBS) test, which is typically done between weeks 35 and 37. GBS is a common bacteria that about 25% of healthy adults carry. It's harmless to you but can be transmitted to your baby during delivery. A positive result simply means you'll receive antibiotics during labor — straightforward and effective.
Sleep deprivation may feel like a permanent state at this point. Between the physical discomfort, the bathroom trips, the anxiety about labor, and the Braxton Hicks contractions, getting more than a few hours of consecutive sleep is a real achievement. Be gentle with yourself — your body is doing something extraordinary, even when it doesn't feel like it.
If you haven't started thinking about postpartum recovery, now is a good time. Stock up on pads, comfortable underwear, stool softeners, and anything that sounds soothing for the first weeks after delivery.
For dads
Seven weeks out. If your partner mentions that the baby has dropped lower in her pelvis, that's a sign her body is preparing for labor — though it doesn't mean labor is imminent. It could be weeks away. What it does mean is that she's likely more uncomfortable than ever: pelvic pressure, constant bathroom trips, and difficulty walking comfortably. This is the week to have a serious conversation about your labor plan logistics. Do you know the fastest route to the hospital at different times of day? Do you have a backup plan if you're not home when labor starts? Is your phone charged and your hospital bags in the car? Who will handle pets, older children, or household tasks while you're at the hospital? Having these details nailed down now prevents panic later.
Start thinking about the first few days after birth. Your partner will be recovering from delivery (whether vaginal or cesarean), learning to feed a newborn, and running on almost no sleep. You will be the operational backbone of the household. That means meals, laundry, visitors management, and everything else that needs to happen while she focuses on recovery and the baby. Here's an uncomfortable truth that nobody tells new dads: the first week home is often harder than anyone expects. It's beautiful and overwhelming and exhausting in ways you can't fully prepare for. But knowing that in advance — and having a plan for support — makes it manageable. Line up help, accept every meal offer, and lower your standards for household perfection.
Common concerns
What is the Group B Strep test?+
Group B Streptococcus (GBS) is a common bacteria that about 25% of healthy adults carry, usually in the digestive tract or vagina. It's harmless to you but can potentially be passed to your baby during vaginal delivery, where it can cause serious infections. The GBS test is a simple vaginal and rectal swab done between weeks 35-37. If you test positive, you'll receive intravenous antibiotics during labor, which is highly effective at preventing transmission. A positive result is not cause for alarm — it's a routine and easily managed finding.
What does it mean if the baby has dropped?+
When your baby 'drops' or descends lower into your pelvis, it's called lightening or engagement. The baby's head moves down into the pelvic cavity in preparation for birth. For first-time parents, this can happen 2-4 weeks before labor. For subsequent pregnancies, it may not happen until labor begins. You may notice easier breathing but increased pelvic pressure, more frequent urination, and a waddling gait. Lightening is a positive sign that your body is preparing, but it doesn't predict when labor will start.
Should I start perineal massage?+
Research suggests that perineal massage starting around 34-35 weeks may reduce the risk of tearing during vaginal delivery, particularly for first-time parents. The technique involves gently stretching the tissue between the vagina and rectum to increase flexibility. Your provider or a childbirth educator can explain the technique, or you can find reliable instructions from medical sources. Use a clean, natural oil (like coconut or olive oil) and practice for about 5-10 minutes, a few times per week.
When should I go to the hospital during labor?+
The general guideline is the 5-1-1 rule: go to the hospital when contractions are 5 minutes apart, lasting 1 minute each, and this pattern has continued for 1 hour. However, your provider may give you specific instructions based on your individual situation — for example, if you live far from the hospital, have a history of fast labor, or have risk factors. Go immediately if your water breaks, you have heavy bleeding, or you feel decreased fetal movement. When in doubt, call your provider's on-call line.
Product picks for week 33
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Postpartum recovery essentials kit
Stock up now on pads, witch hazel, a peri bottle, and comfort items for the first weeks of recovery after delivery.
Nursing nightgown
Easy-access nightwear makes middle-of-the-night feedings simpler — invest in 2-3 comfortable options for the postpartum weeks.
Freezer meal prep containers
Batch-cook meals now while you have energy — labeled freezer containers make meal prep organized and postpartum dinners effortless.
A quick note: This content is for informational purposes only and is not a substitute for professional medical advice. Always talk to your healthcare provider about any questions or concerns. Learn how we create our content.
Content based on guidance from the American College of Obstetricians and Gynecologists (ACOG), the American Academy of Pediatrics (AAP), Mayo Clinic, and peer-reviewed medical literature. Learn more about how we create our content.