39 Weeks Pregnant

You’re in the third trimester and your baby is about the size of a small watermelon. Here’s how your baby is developing, what you might feel, and the check-ups to plan this week.

Reviewed against ACOG & WHO guidance Updated 25 September 2026
Baby is about the size of
A small watermelon (tarbooz)
Length ~50.7 cmWeight ~3.3 kgTrimester 3Month 9

Sizes are averages; from week 20 length is measured head to heel. Not sure which week you’re in? Calculate it.

Your baby at 39 weeks

Full term. Fat layers help your baby regulate temperature after birth, and the skin has turned from red to pink. The brain is still growing fast and will continue to after birth.

Your body at 39 weeks

Your cervix may be softening and starting to open. Waiting can feel long!

Common symptoms this week

  • Pelvic pressure
  • Cervical changes
  • Impatience

Tips & to-do list

  • Keep counting movements – babies do not move less before labour.
  • Walk if comfortable, and rest in between.
  • Don’t skip check-ups.

Check-ups and tests around this week

  • Weekly antenatal visits; baby’s position and wellbeing checks

Week 39 at a glance

At 39 weeks
TrimesterThird trimester
Pregnancy monthMonth 9 of 9
Weeks to due date1 weeks
Days pregnant273–279 days
Progress98% of 40 weeks

When to call your doctor

Contact your doctor or go to hospital straight away if you notice:

  • Reduced or changed baby movements
  • Waters breaking or any bleeding
  • Severe headache, vision changes, pain under the ribs
  • Regular painful contractions before 37 weeks
  • Severe itching of palms and soles

Questions about 39 weeks pregnant

How many months is 39 weeks pregnant?

39 weeks pregnant falls in month 9 of pregnancy, in the third trimester. For medical purposes, weeks and days are more precise than months.

How big is my baby at 39 weeks?

At 39 weeks your baby is about the size of a small watermelon (tarbooz) – roughly ~50.7 cm long and weighing about ~3.3 kg.

Is it normal to have no symptoms at 39 weeks?

Yes. Every pregnancy is different, and symptoms come and go. Feeling well is not a sign that something is wrong. If you have concerns, or notice any warning signs listed on this page, contact your doctor.

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Medical disclaimer: The results and information on this page are estimates for general education only. They are not a diagnosis and do not replace advice from your gynaecologist, obstetrician or midwife. If you have pain, bleeding, reduced baby movements or feel unwell, contact your doctor or call 108 immediately. Read the full disclaimer.

Written by the Pregnancy Calculator editorial team. Based on published obstetric guidance (ACOG, WHO, MoHFW India, FOGSI). Last updated . How we create content.