Pregnancy Guide

39 Weeks Pregnant

Your baby is the size of a Jackfruit (Large). Discover exactly what is happening to your body and your baby this week.

New pregnancy guide: Learn how weeks are counted, what each trimester means, and how to interpret your calculator results for better preparation and planning. Read the full guide

Week 39 in detail

Every extra day is still doing brain and lung work

Baby this week

Average length is about 50 cm and weight around 3.3 kg — averages lie, your baby will not be a pumpkin on a scale until after birth. Brain and lungs still benefit from staying in. Hair may be a full head or peach fuzz.

  • Size on the scan this late is an estimate with a wide error bar
  • Passing meconium in labour is a reason for extra monitoring, not a personal failure
  • The skull will mould — cone head is temporary

Your body this week

Watch for: a labour pattern your unit named, waters breaking, or a show that is more than a smear plus contractions. Rest. Eat. You do not need to walk the baby out unless movement feels good.

  • The 5-1-1 (or your unit’s) rule is a guide; bleeding or a green gush is come-in-now
  • A bassinet sheet washed now is a kindness
  • Hydration still affects contractions feeling crampy

Get ready

Review when they want you to call. The checklist above is protocol, home setup, and a playlist or quiet — your choice. If kicks drop, skip the nesting and go in.

A general guide, not medical advice. Scan timing and symptoms vary — ask your clinician.

Baby Growth Curve

This chart visualizes the average length of the baby from week 1 to 40. Values are based on standard clinical averages.

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