40 weeks pregnant
At 40 weeks your baby is about the size of a watermelon (about 51 cm · 3.5 kg). Here is what is happening for you both this week.
- Size
- a watermelon
- Length · weight
- about 51 cm · 3.5 kg
- Trimester
- Third
- Weeks to go
- 0
Your baby at 40 weeks
This is your estimated due date. Only about 1 in 20 babies arrive on it.
Your body at 40 weeks
If you go past your due date, your care team will talk about monitoring and when to consider induction.
Your to-do list for week 40
- Keep monitoring movements and call if they change
Common questions
How many months pregnant is 40 weeks?
40 weeks is in month 9 of pregnancy and the third trimester.
How big is my baby at 40 weeks?
At 40 weeks your baby is about the size of a watermelon (about 51 cm · 3.5 kg). Every baby grows at its own pace.
All 40 weeks
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Useful tools
PregnancyDue date calculatorInstant due date, week and trimester.PregnancyPregnancy plannerEstimate dates and organise the weeks ahead.PregnancyAppointment trackerScans, tests, vaccinations and questions in one list.
Related guides
PregnancyHospital bag checklist for Australian parentsPlan separate bags for labour, the post-birth stay and the trip home. Ask your hospital what it supplies.Dads & partnersSupporting your partner during labour and birthWhat to pack, what to do and how to advocate on the day.NewbornFirst baby essentials: a practical Australian checklistPrioritise a safe sleep space, suitable clothing, feeding supplies and a safe way to travel.Health & safetySafe sleep: the guidelines in plain EnglishSix simple steps that lower the risk of sudden unexpected death in infancy.