Third Trimester ยท Weeks 28โ€“40
Week 33
Sweet. Sour. Bitter. Already theirs.
You are mere weeks away from the greatest meeting of your life.
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292mm
Length
1.9kg
Weight
Your progress
Week 33 of 40 ยท 7 weeks to go
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What's happening with your baby

Every skill rehearsed last week continues. The fat accumulates โ€” the baby has reached 1.9kg and is gaining approximately 250g per week. The brain and nervous system are in the final phase of their extraordinary third-trimester maturation. And this week adds the last piece of the sensory education that began at week 16: the ability to distinguish between categories of taste.

Sweet, sour, and bitter โ€” a palate forming from your plate At week 19 your baby first tasted the amniotic fluid and the compounds carried in it from your diet. At week 33 the taste system has matured to the point of categorical discrimination: sweet, sour, and bitter are now detected and distinguished as separate sensory experiences. Research has shown that foetuses swallow more amniotic fluid when it is sweeter โ€” they show a clear preference, demonstrably responding to the flavour profile of what their parent eats.

The dietary variety of these final weeks continues to matter. Flavour compounds from vegetables, herbs, spices, and varied protein sources all reach the amniotic fluid within hours of eating. The palate forming right now is being shaped by your food choices โ€” a process that connects directly to the range of flavours your baby will accept when weaning begins. This is not a reason for anxiety about imperfect eating; it is an invitation to eat with variety and pleasure where possible. See the Healthy Pregnancy: Lifestyle, Diet & Decisions guide for more.

The brain and nervous system maturation happening this week is less a discrete event than an acceleration โ€” more neural connections forming, more myelin (the protective sheath around nerve fibres) being laid down, the communication pathways between different brain regions becoming faster and more reliable. This is the neurological preparation for a life of perception, thought, emotion, and response. By birth, the baby will have more synaptic connections than at any other point in life โ€” a period of extraordinary potential that begins right now.

The baby has also settled, for most people, into a consistent head-down position. The 34-week appointment โ€” one week away โ€” will confirm this. The space to move is now limited enough that position changes are less common, though not impossible: around 3โ€“4% of babies remain breech at term.

At thirty-three weeks I started thinking differently about what I ate. Not anxiously โ€” just mindfully. I'd have a bowl of soup with herbs and think: that's going to them. I'd eat a strong, bitter salad leaf and wonder if they'd pull a face at it, the way newborns do. It made eating feel companionable rather than medicinal. I was cooking for two in a much more specific sense than I'd realised.

Francesca, 31 WiseMama community First pregnancy
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Pre-eclampsia: know these signs now

Week 33 is the week where pre-eclampsia risk peaks in the third trimester, and the data card explicitly names it. This is not cause for alarm โ€” pre-eclampsia affects around 6% of pregnancies and the majority of cases are identified and managed well through routine monitoring. But it requires prompt reporting, and knowing what to look for is the difference between early management and a serious emergency.

Report same-day if you experience any of the following:

โ€” Severe headache that does not respond to paracetamol
โ€” Vision changes: blurring, seeing spots or flashing lights
โ€” Sudden swelling of the face, hands, or feet โ€” particularly if asymmetric or rapidly worsening
โ€” Pain below the ribs on the right side
โ€” Vomiting alongside any of the above

These symptoms individually can have innocent explanations. Together, or persistently, they require same-day assessment โ€” not the next scheduled appointment. Call your maternity unit's triage line directly.

Do not wait to see if it resolves. Do not Google and reassure yourself. Call.

Pre-eclampsia is identified through the blood pressure and urine protein checks at every appointment โ€” which is why attending all appointments matters. Between appointments, you are the early warning system. The Pregnancy Complications: Knowing the Warning Signs topic guide covers pre-eclampsia and other conditions in full โ€” if you haven't read it, week 33 is the time.

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What's happening to your body

Beyond the pre-eclampsia awareness, the physical experience of week 33 continues the demanding pattern of the late third trimester. The rib pain introduced last week is now common โ€” the fundal height is approximately 33cm, the uterus pressing firmly against the lower ribs. The breathlessness continues. The sleep is fragmented. The baby's movements, now substantial in force, are felt throughout the day and night.

Headaches in pregnancy โ€” when to act Headaches are common in the third trimester for multiple reasons: disrupted sleep, dehydration, tension from posture changes, and hormonal fluctuation. Most are benign and respond to rest, hydration, and paracetamol (safe in pregnancy at recommended doses). However: a headache that is severe, persistent, does not respond to paracetamol, or is accompanied by visual disturbance, swelling, or right-sided abdominal pain should be reported to your midwife or maternity triage the same day. It may indicate pre-eclampsia and requires assessment. The distinction between a tension headache and a hypertensive headache cannot be made reliably by the person experiencing it โ€” if in doubt, call.
Pelvic floor โ€” the most important exercise of the third trimester With seven weeks until the due date, pelvic floor exercises are now urgent rather than merely advisable. The pelvic floor muscles support the uterus, bladder, and bowel; they are under significant strain from the weight of the baby and will be asked to do significant work during birth and recovery. Regular pelvic floor exercises in the final weeks of pregnancy are associated with shorter second stages of labour, reduced perineal trauma, and faster postnatal recovery. The Pelvic Floor: Strengthen, Protect & Recover guide covers exactly how to do them correctly โ€” not just "squeeze," but the specific technique that actually engages the right muscles. Read it this week if you haven't already.
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WiseMama Topic
Pelvic Floor: Strengthen, Protect & Recover
The technique, the timing, the recovery. Essential reading at 33 weeks โ€” your pelvic floor will thank you.
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How you might be feeling

Seven weeks. The "mere weeks" of the affirmation are now genuinely few. The third trimester in these final weeks has a particular quality โ€” a combination of physical tiredness, emotional intensity, and a growing impatience-that-is-also-apprehension that is entirely its own experience. Most people describe this period as simultaneously the hardest and the most vivid of the whole pregnancy.

Anxiety about birth โ€” if it has been present โ€” is often most acute in weeks 33โ€“36. The birth feels close enough to be real but not yet close enough for the preparation to feel complete. This is the window where antenatal education delivers its best return: attending classes, reading thoroughly, having frank conversations with your midwife about what labour actually involves. Knowledge gathered now sits in the memory in a way that knowledge gathered at 38 weeks cannot. The Preparing for Labour & Birth and Hypnobirthing: Calm Birth Techniques guides are both worth reading or revisiting this week.

Thirty-three weeks was when it stopped being possible to pretend I had plenty of time. The physical exhaustion made the weeks feel very long, but the calendar was telling a different story. I spent a lot of that week with the birth preparation guide. Not because I was panicking โ€” because being informed was the only thing that made me feel less overwhelmed. It worked.

Harriet, 32 WiseMama community First pregnancy

The relationships around you may also be shifting. Partners, family, and friends are increasingly aware that the birth is close. People who have been relatively hands-off during the pregnancy may begin to engage more, offer more, ask more. Receiving support gracefully โ€” accepting help that is genuinely useful, declining help that isn't, and being specific about what you actually need โ€” is a skill worth cultivating right now. The Building Your Support Network guide has practical guidance on exactly this.

For your partner
Week 33: Active preparation, not passive support

Seven weeks. The preparation window for partners is narrowing just as it is for the person carrying the pregnancy. The things that need to be in place โ€” practical, logistical, relational โ€” need to be in place now, not in the final week before the due date when stress and physical discomfort make everything harder.

The pre-eclampsia warning signs in this week's body section are worth you reading and knowing too. You may be the person who notices something is wrong โ€” an unusually severe headache, swelling that has appeared quickly, your partner seeming unwell in a way they're not articulating. Knowing what to look for and acting on it without being asked is one of the most genuinely valuable things a partner can do in the final trimester.

  • Read the birth topic together. The Preparing for Labour & Birth guide covers what partners do during labour โ€” not just "be there" but specifically: what support looks like during contractions, how to manage the environment, what to say and not say, when to contact the midwife. This is information that partners need before they need it.
  • Know the pre-eclampsia signs. See the body section above. You are also a watcher. If your partner reports a severe headache or vision changes, take it seriously and help them call.
  • 34-week appointment next week. Attend. It confirms position, reviews blood pressure, and is a key point for any remaining birth preference questions. Being present keeps you informed and keeps the preparation shared.
  • After-birth reading. The Fourth Trimester, Parent Mental Health, and Body After Birth guides are all worth reading now. The postnatal period is the phase that partners most consistently report being underprepared for.
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Your one key action this week

Read the Pregnancy Complications guide โ€” this week, not later. The Pregnancy Complications: Knowing the Warning Signs topic covers pre-eclampsia, placental abruption, reduced movement, preterm labour, and other conditions that can arise in the final trimester. Understanding what to look for, how to distinguish concerning symptoms from normal discomfort, and crucially โ€” what number to call and what to say when you call โ€” means you will respond appropriately and promptly if the need arises.

The single most common reason for delayed treatment of late-pregnancy complications is uncertainty about whether something is serious enough to report. The answer to that uncertainty is always the same: call and let a midwife assess. You cannot be "too cautious" in the third trimester. The only error that carries risk is waiting.
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WiseMama Topic โ€” Read This Week
Pregnancy Complications: Knowing the Warning Signs
Pre-eclampsia, reduced movement, preterm labour, placental abruption. Know the signs. Know what to do. Essential at 33 weeks.
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Question to ask at the 34-week appointment

The 34-week appointment is next week. Arrive with two specific questions:

"Can you confirm the baby's position, and is there anything specific I should know about the 36-week appointment โ€” particularly around position, colostrum harvesting, and the Group B Strep swab?"

The 36-week appointment is the last major decision-making appointment before birth: position is formally assessed, options for a breech baby are discussed if relevant, GBS swab may be offered, colostrum harvesting can begin, and birth preferences are finalised. Understanding what that appointment will involve โ€” one week in advance โ€” means you arrive at it prepared rather than reactive.

What are you eating today?
They can now tell sweet from sour from bitter. Write about the meals you've been sharing with them โ€” and what you hope they'll love when they finally sit at your table.
Open my diary โ†’