you're 33 weeks pregnant.
last revised · baby is about 43.7 cm (17.2") · 1920 g (67.7 oz)
At 33 weeks pregnant, your baby is about 43.7 cm and 1920 g — Your baby's immune system is borrowing antibodies from you, building defenses for life outside.
about the size of a…
Your baby's immune system is borrowing antibodies from you, building defenses for life outside.
this week's highlights
- Immune system loads up on antibodies
- Bones harden (skull stays soft)
- Lanugo mostly gone
- Lungs work in practice mode
how your baby looks
Cheeks rounder, body fuller. Skull bones remain soft and flexible to ease passage through the birth canal.
body in focus
- head
- Skull bones stay soft for birth.
- body
- Immune antibodies pass through the placenta.
- hands
- Hands and fingers move purposefully.
- feet
- Hiccup-like rhythmic kicks happen daily.
what's happening in your body
Belly is large and high. Heartburn, swelling, and back ache continue. The baby drops lower over the coming weeks.
symptoms at 33 weeks
- Deep pelvic ache
- The baby's head pressing into the pelvis strains loosened joints, especially after walking. Frequent sitting breaks, warm baths, and a support belt spread the load.
- Numb patches on the bump
- Stretched skin and compressed surface nerves can leave small numb or tingly areas on the belly. It is harmless and resolves after birth.
- Increased clumsiness of hands
- Overnight fluid retention can make hands stiff and fumbling in the morning. Gentle fist-clenching exercises before getting up loosen them.
- Braxton Hicks in clusters
- Tightenings may come in evening clusters after busy days. Water, a bath, and lying on your left side should settle them — if they organise into a regular pattern before 37 weeks, call your midwife or maternity unit.
- Feeling too hot to sleep
- Peak blood volume makes nights sweaty. A cooler room and layered bedding you can shed help more than pushing through.
- Strong urge to nest
- A sudden drive to clean, sort, and prepare is common now. Enjoy it, but delegate ladders, heavy lifting, and chemical-heavy jobs.
gentle tips
- Talk through your birth plan with your support team.
- Pack hospital bag including snacks, phone charger, and slippers.
- Sleep propped up and on the left side.
- Eat dates daily in the last weeks — linked to easier labor.
- Track movement patterns daily.
your week 33 checklist
- Install the car seat in the car you will actually use for the hospital trip and have the fit checked.
- Cook and freeze at least four extra meals for the newborn weeks.
- Decide on your baby's sleeping arrangement and set up the crib or bedside sleeper.
- Book your week 34 and 36 appointments if they are not already in the diary.
what to expect next
Group B Strep test offered around weeks 35–37. Birth could happen anytime from week 37 (full term) to 42.
common questions at week 33
How big is the baby at 33 weeks?
At 33 weeks, the baby measures about 43.7 cm and weighs approximately 1920 g (43.7 cm (17.2") · 1920 g (67.7 oz)).
What is developing at 33 weeks?
Cheeks rounder, body fuller. Skull bones stay soft for birth. Key milestones this week include: Immune system loads up on antibodies; Bones harden (skull stays soft); Lanugo mostly gone; Lungs work in practice mode.
What symptoms are common at 33 weeks pregnant?
Belly is large and high. Heartburn, swelling, and back ache continue. The baby drops lower over the coming weeks.
What should I do at 33 weeks pregnant?
Group B Strep test offered around weeks 35–37. Talk through your birth plan with your support team. Pack hospital bag including snacks, phone charger, and slippers. Sleep propped up and on the left side.
What actually helps swollen feet at 33 weeks?
Elevation above heart level for twenty minutes several times a day, compression socks put on before getting out of bed, staying hydrated, and regular ankle-pumping movements are the combination that works. Reducing salt slightly helps some people, but do not restrict fluids — dehydration makes swelling worse. Sudden swelling, or swelling with headache or vision changes, is different: call your midwife or doctor the same day.
Why do my baby's movements hurt my ribs now?
With less room to manoeuvre, stretches and kicks land against your ribs and organs with real force, especially if your baby is head-down with feet up. Sitting tall, side-stretching away from the pressure, and spending time on all fours can shift a wedged foot. Painful movements are normal at this stage — but remember it is the pattern of movement, not the strength, you are monitoring; reduced movements always mean contacting your maternity unit immediately.
Is raspberry leaf tea worth taking before labour?
Raspberry leaf is traditionally used from around week 32 to tone the uterus, but the research evidence for meaningful benefit is weak and it is not suitable for everyone — including some people with previous caesareans or pregnancy complications. If you want to try it, discuss it with your midwife first and introduce it gradually. No tea replaces the things that demonstrably matter: movement awareness, appointments, and rest.
helpful tools
- Kick Counter
Daily kick counts are an important reassurance in the third trimester.
- Contraction Timer
Time contractions and track frequency when the moment comes.
- Hospital Bag
Curated packing checklist for labor and delivery.
Medically aligned with guidance from WHO, NHS and ACOG. How we write.