How big is the baby at 27 weeks pregnant?

a head of cauliflower, 36.6 cm, 875 g

Which tests and checkups are due at 27 weeks?

28-week tests are often done this week or next: haemoglobin, and the antibody test for Rh-negative women. Visits move to every two weeks from 28 weeks, and the third screening ultrasound is due between 28 and 32 weeks.

When should I call a doctor at 27 weeks?

Any vaginal bleeding, or fluid leaking from the vagina Regular, painful tightenings or period-like cramps A severe headache, blurred vision, or sudden swelling of your face and hands Severe or persistent abdominal pain, fever, or pain when you pass urine

Second trimester · 27 weeks pregnant

Week 27: the second trimester ends

Regular sleep cycles, hiccups and recognisable voices.

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Your baby sleeps and wakes on a schedule, opens and closes its eyes and sucks its fingers. The lungs could work with medical help if the baby were born now. Your voice is recognised.

Size and weight

About the size of

a head of cauliflower

Length

36.6 cm

Weight

875 g

Averages from standard growth charts. Measured crown to rump until week 20 and head to heel afterwards.

How your baby is developing

Regular sleep and wake cycles; the baby may dream during REM sleep.
The baby sucks fingers, hiccups and opens and closes its eyes.
The lungs could function with support if birth happened now.
The brain is very active and recognises familiar voices.

How you may feel

Breathlessness
Leg cramps
Swelling
Backache
Carpal tunnel
Vivid dreams
Itchy skin

Rhythmic little jumps in your belly are usually the baby hiccuping. They are harmless and can happen several times a day.

What's next

Tests and appointments

28-week tests are often done this week or next: haemoglobin, and the antibody test for Rh-negative women.
Visits move to every two weeks from 28 weeks, and the third screening ultrasound is due between 28 and 32 weeks.

What to do this week

Start antenatal classes if they have not begun.
Draft your birth preferences: pain relief, positions, who is with you, feeding plans.
Confirm maternity leave dates with your employer.

Call your doctor or maternity hospital if

Any vaginal bleeding, or fluid leaking from the vagina
Regular, painful tightenings or period-like cramps
A severe headache, blurred vision, or sudden swelling of your face and hands
Severe or persistent abdominal pain, fever, or pain when you pass urine

If something feels wrong, trust yourself and call 103 or your maternity hospital. You will never be wasting anyone's time.

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