27 weeks pregnant
At 27 weeks you are in the second trimester, and your baby measures about 37 cm from head to heel and weighs about 875 g, roughly the length of a bunch of celery. This is the last week of the second trimester, and the Parental Leave Pay and Family Tax Benefit claims can be lodged from now, 13 weeks before the due date.
Weighs about 875 g, like a sourdough loaf. Averages from standard growth tables; your scan gives your baby's own numbers.
Your baby at 27 weeks
Regular sleep–wake cycles; the brain is very active. Curled in the fetal position and filling out with fat; the eyes open from about week 26.
How you might feel
Breathlessness, heartburn and pelvic aches increase as the uterus rises, and Braxton Hicks tightenings are more noticeable.
Last week of the second trimester. The Parental Leave Pay claim can be lodged from 3 months before the due date.
Call the maternity unit today for bleeding, fluid loss, a severe headache or vision changes. 13 HEALTH (13 43 25 84) in Queensland; 000 in an emergency.
What's due this week in Australia
Whooping cough (pertussis) vaccine
Free under the National Immunisation Program in every pregnancy.
Put your name on childcare waitlists
If you plan to use childcare in the first year, many centres have waitlists of 6–12 months.
Gestational diabetes test (OGTT)
A fasting 75 g oral glucose tolerance test at a pathology collection centre: a fasting blood sample, the drink, then samples at 1 and 2 hours.
26–28-week blood tests
Full blood count (iron) and blood-group antibodies, usually drawn with the glucose test.
Lodge the Parental Leave Pay and Family Tax Benefit claims
You can lodge up to 3 months before the due date through myGov → Centrelink.
28-week antenatal visit
Blood pressure, fundal height, the glucose and blood results, and the start of the third trimester.
Coming up: RSV vaccine (Abrysvo)
Free under the National Immunisation Program, one dose per pregnancy from 28 weeks and ideally before 36 weeks.
Coming up: Give written notice of parental leave
The Fair Work Act requires at least 10 weeks’ written notice before unpaid parental leave starts.
Checklist for the week
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Questions about 27 weeks
How many months is 27 weeks pregnant?
About six months, the end of the second trimester.
What trimester is 27 weeks?
Week 27 is in the second trimester. In the Australian guidelines Hello Bub follows, the first trimester runs to 13 weeks, the second from 14 to 27 and the third from 28 weeks.
How much is Parental Leave Pay?
It is paid at the national minimum wage rate, with superannuation on top, for days you can share with your partner. The Parental Leave Pay calculator works out the total and the claim dates for your due date.
Written by the Hello Bub team; medical schedule follows the Australian Pregnancy Care Guidelines; last reviewed 3 November 2026.