28 weeks pregnant
At 28 weeks you are in the third trimester, and your baby measures about 38 cm from head to heel and weighs about 1.00 kg, roughly the length of a butternut pumpkin. The third trimester starts, the 28-week antenatal visit falls between 27 and 29+6, the RSV vaccine window opens, and anti-D is given this week if you are Rh negative.
Weighs about 1.00 kg, like a 1 kg bag of sugar. Averages from standard growth tables; your scan gives your baby's own numbers.
Your baby at 28 weeks
The baby can blink and dream (REM sleep). Curled in the fetal position and filling out with fat; the eyes open from about week 26.
How you might feel
Breathlessness, heartburn and backache are common, and from now you should get to know your baby's usual pattern of movements.
Third trimester. Anti-D if Rh negative, the RSV vaccine window opens, and start noticing movement patterns.
Call the maternity unit today for any change in your baby's movements, 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.
RSV vaccine (Abrysvo)
Free under the National Immunisation Program, one dose per pregnancy from 28 weeks and ideally before 36 weeks.
Give written notice of parental leave
The Fair Work Act requires at least 10 weeks’ written notice before unpaid parental leave starts.
Wills, guardianship, super and insurance
Make or update wills and name a guardian.
Coming up: 31-week antenatal visit (first pregnancy)
Blood pressure, fundal height, movements and a check of results.
Checklist for the week
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Questions about 28 weeks
How many months is 28 weeks pregnant?
About six and a half months, the start of the third trimester.
What trimester is 28 weeks?
Week 28 is in the third 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.
What is the RSV vaccine in pregnancy?
Abrysvo, a single dose between 28 and 36 weeks, free under the National Immunisation Program. It protects the baby from severe RSV in the first months of life; babies whose mothers were not vaccinated can be given the antibody nirsevimab instead.
Written by the Hello Bub team; medical schedule follows the Australian Pregnancy Care Guidelines; last reviewed 3 November 2026.