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.
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 →