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Pregnancy Guide·Second Trimester

Week 27: Second Trimester Ends

Head of broccoli (~24cm crown-rump)·Last reviewed: 25 April 2026
Quick answer

Week 27 marks the end of the second trimester. Your baby can open and close their eyes and has a regular sleep-wake pattern. According to Nuhah's pregnancy guide, the third trimester begins next week.

Baby development at week 27

The second trimester is ending. The baby can open and close their eyes and has established sleep-wake patterns. They hiccup regularly, which you might feel as rhythmic little jolts. The lungs are maturing but would still need support if the baby were born now. The baby weighs about 1,000g and is roughly 36.6cm from head to toe.

Your body this week

The third trimester starts next week. You may already be feeling some third-trimester symptoms: shortness of breath, trouble sleeping, swollen ankles, and more frequent Braxton Hicks. Your midwife appointments will become more frequent soon. Enjoy the last week of the second trimester.

Things to do this week

1
Prepare for the third trimester with extra rest and self-care
2
Start thinking about your hospital bag contents
3
Finalise any nursery preparation plans
4
Book third-trimester antenatal appointments if not already scheduled

Frequently asked questions

When does the third trimester start?

The third trimester begins at week 28 and runs until birth (typically around week 40). It is the final stretch where your baby gains the most weight and the lungs and brain undergo final maturation. Antenatal appointments become more frequent.

Related reading

Wellbeing
The Second Trimester: What to Expect

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