Pregnancy week by week
Detailed guides for every week — baby development, symptoms, nutrition, partner support, warning signs, FAQs, and a listen-along audio option for each week.
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First Trimester
Weeks 1–13
Week 1
Just the beginning
Pregnancy is counted from the first day of your last period, so week 1 is before conception. Week 1 can feel abstract…
Read full guide →Week 2
A tiny spark
Your body is preparing to release an egg; conception usually happens around the end of this week. Your body is moving…
Read full guide →Week 3
About the size of a a cluster of cells
A fertilised egg becomes a tiny ball of cells and begins its journey to the womb. If conception happens this week, th…
Read full guide →Week 4
About the size of a poppy seed
The embryo settles into the womb lining; a positive test may show around now. Implantation is often happening around…
Read full guide →Week 5
About the size of a sesame seed
The tiny heart and basic structures begin to form. This is one of the most active early-building weeks, even if from…
Read full guide →Week 6
About the size of a lentil
A flickering heartbeat may be detected on an early scan. Week 6 is memorable because an early scan may pick up a flic…
Read full guide →Week 7
About the size of a blueberry
Little limb buds appear and the brain is developing fast. There is a lot of visible shaping happening now, even if yo…
Read full guide →Week 8
About the size of a raspberry
Fingers, toes, and tiny facial features start to take shape. Week 8 often feels like a practical turning point becaus…
Read full guide →Week 9
About the size of a grape
The embryo is now called a foetus and is moving (though you can't feel it yet). One lovely milestone this week is tha…
Read full guide →Week 10
About the size of a strawberry
Vital organs are formed and beginning to function. Week 10 is a reassuring milestone because the basic organ systems…
Read full guide →Week 11
About the size of a fig
Tiny tooth buds and nail beds are forming. Week 11 often feels like a bridge between the roughest early symptoms and…
Read full guide →Week 12
About the size of a lime
Reflexes are developing; the riskiest early phase is easing. Week 12 is a landmark week because dating or nuchal scan…
Read full guide →Week 13
About the size of a pea pod
Fingerprints are forming and the body is catching up with the head in size. You are closing out the first trimester,…
Read full guide →Second Trimester
Weeks 14–27
Week 14
About the size of a lemon
Welcome to the second trimester — often the most comfortable stretch. Welcome to the second trimester, a phase many p…
Read full guide →Week 15
About the size of a orange
Baby can sense light and is practising tiny movements. Week 15 often feels quieter on the outside, but the baby is be…
Read full guide →Week 16
About the size of a avocado
Little facial muscles allow squints and frowns; you may feel first flutters soon. Week 16 is exciting because first f…
Read full guide →Week 17
About the size of a turnip
Baby is growing stronger and building a little fat layer. The baby is growing into more strength this week, and pregn…
Read full guide →Week 18
About the size of a bell pepper
Hearing is developing — baby may start to hear muffled sounds. Week 18 brings a lovely sensory milestone because the…
Read full guide →Week 19
About the size of a mango
A protective coating forms on baby's skin. You are getting close to the halfway point, and many parents begin feeling…
Read full guide →Week 20
About the size of a banana
Halfway there! The mid-pregnancy scan often happens around now. Halfway there is a big emotional milestone, and week…
Read full guide →Week 21
About the size of a carrot
Movements are getting stronger and more regular. After the big scan week, pregnancy often settles into a rhythm where…
Read full guide →Week 22
About the size of a spaghetti squash
Baby looks more like a tiny newborn now, with lips and eyebrows. Week 22 is one of those weeks when the baby starts l…
Read full guide →Week 23
About the size of a grapefruit
Baby is putting on weight and the lungs are developing. The baby is growing more resilient week by week now, and that…
Read full guide →Week 24
About the size of a corn cob
Baby's face is fully formed and skin is becoming less see-through. Week 24 can feel like the true beginning of the la…
Read full guide →Week 25
About the size of a cauliflower
Baby is responding to your voice and to sounds outside. Week 25 is often a sweet bonding week because the baby respon…
Read full guide →Week 26
About the size of a lettuce
Eyes begin to open and baby takes practice 'breaths' of fluid. There is a wonderful sense of activity in week 26 beca…
Read full guide →Week 27
About the size of a cabbage
The second trimester wraps up; baby's brain is very active. You are wrapping up the second trimester, and week 27 oft…
Read full guide →Third Trimester
Weeks 28–42
Week 28
About the size of a eggplant
Welcome to the third trimester — the home stretch begins. Welcome to the third trimester, the home stretch where grow…
Read full guide →Week 29
About the size of a butternut squash
Baby's muscles and lungs continue to mature. Week 29 is about steady maturing, and many parents notice the baby's mov…
Read full guide →Week 30
About the size of a cucumber
Baby can open and close their eyes and may follow light. Week 30 often makes the final trimester feel unmistakably re…
Read full guide →Week 31
About the size of a coconut
Rapid brain development continues; baby is gaining weight steadily. The baby is adding weight and brain power quickly…
Read full guide →Week 32
About the size of a jicama
Baby often settles into a head-down position around now. Week 32 often brings a sense of momentum because the baby ma…
Read full guide →Week 33
About the size of a pineapple
Baby's bones are hardening (except the soft skull, by design). Week 33 is a strength-building week for the baby and a…
Read full guide →Week 34
About the size of a cantaloupe
The central nervous system and lungs are maturing well. Week 34 can bring a strong nesting energy for some parents an…
Read full guide →Week 35
About the size of a honeydew melon
Baby is filling out and has less room to somersault. The baby is filling out quickly now, and you may feel a shift fr…
Read full guide →Week 36
About the size of a romaine lettuce
Baby is likely head-down and getting ready to meet you. Week 36 has a distinctly final-stretch feeling, with many par…
Read full guide →Week 37
About the size of a swiss chard
Baby is considered early-term; lungs are nearly ready. Week 37 is a real milestone because the baby is considered ear…
Read full guide →Week 38
About the size of a leek
Baby continues to gain a little weight and shed the protective coating. Week 38 is a waiting week for many families,…
Read full guide →Week 39
About the size of a mini watermelon
Baby is full-term and ready for the outside world. Week 39 carries a strong sense of readiness, even though babies st…
Read full guide →Week 40
About the size of a small pumpkin
Your due date! Remember, only a few babies arrive exactly on time. This is your due-date week, and one of the most im…
Read full guide →Week 41
About the size of a watermelon
Going a little past your date is common and usually fine. Week 41 can test patience, but it is also a week when monit…
Read full guide →Week 42
About the size of a watermelon
Most babies have arrived by now; your care team will guide you closely. Week 42 is uncommon, and care usually becomes…
Read full guide →Common pregnancy symptoms
Reassuring, medically reviewed guides to the symptoms people ask about most — what's normal, what helps, and when to see a doctor.
Morning Sickness
First trimester
Nausea and vomiting in early pregnancy — common, usually harmless, and eases by mid-pregnancy for most people.
Read GuideFatigue & Tiredness
First–Third trimester
Deep tiredness driven by pregnancy hormones and the physical demands of pregnancy — common in the first and third trimesters.
Read GuideFood Aversions
First–Second trimester
A sudden dislike of certain foods or smells, common in early pregnancy and usually easing over time.
Read GuideVomiting
First trimester
Being sick in early pregnancy is common and usually manageable — the main risk is dehydration if it becomes severe.
Read GuideBack Pain
Second–Third trimester
Common as your bump grows and posture shifts — usually eased with posture, gentle movement and support, but some patterns need checking.
Read GuideBaby Movements
Second–Third trimester
Get to know your baby's usual pattern — and report ANY reduction or change the same day, day or night.
Read GuideYou may also find these helpful
- Calculator
Due Date Calculator
Estimate your due date and exactly how far along you are from your last period.
Calculate Now - Calculator
Pregnancy Weight Gain
See a healthy weight-gain range for your pre-pregnancy BMI and current week.
Calculate Now - Calculator
Contraction Counter
Tap start and stop to time contraction length, frequency and pattern in labour.
Calculate Now - Tracker
Medicine Tracker
Set dose reminders for prenatal vitamins and medicines so nothing is missed.
Start Tracking
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Explore BabyAbout the pregnancy tracker
Our free pregnancy week tracker follows your pregnancy from week 1 to week 42, with a detailed guide for every week — your baby's development and size, common symptoms, nutrition and self-care tips, warning signs to watch for, and a listen-along audio option. Pair it with the due date calculator to find your week, or the fertility tracker if you're still trying to conceive.
Pregnancy tracker FAQs
- How does the pregnancy tracker work?
- Pick your current week and the tracker shows what's happening that week — your baby's development and size, common symptoms, nutrition and self-care tips, and questions to consider. Follow it week by week across all three trimesters, from week 1 to week 42.
- How do I know which pregnancy week I'm in?
- Pregnancy is counted from the first day of your last menstrual period, not conception, so most people are about two weeks 'pregnant' at conception. Use the due date calculator to find your week and estimated due date.
- Is the pregnancy tracker free?
- Yes. Every weekly guide is free to read with no sign-up. A free ParentVibes account lets you save your due date and add tools like the contraction counter and appointment tracker.
- How many weeks does pregnancy last?
- A full-term pregnancy is around 40 weeks from your last period, though anywhere from 37 to 42 weeks is considered normal. The tracker covers weeks 1 to 42.