25 weeks pregnant
At 25 weeks you are in the second trimester, and your baby measures about 35 cm from head to heel and weighs about 660 g, roughly the length of a continental cucumber. Book the glucose tolerance test and the 26 to 28-week blood tests now if they are not booked, so the results are ready for the 28-week visit.
Weighs about 660 g, like a 600 mL bottle of water. Averages from standard growth tables; your scan gives your baby's own numbers.
Your baby at 25 weeks
The startle reflex appears and the hair has colour. Curled in the fetal position and filling out with fat; the eyes open from about week 26.
How you might feel
Leg cramps at night, heartburn and a stuffy nose are common; eating small meals and staying upright after eating helps.
Leg cramps and heartburn are common: small meals, stay upright after eating.
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.
Book antenatal classes and a hospital tour
Public hospitals run free or low-cost childbirth, breastfeeding and early-parenting classes, in person or online.
Put your name on childcare waitlists
If you plan to use childcare in the first year, many centres have waitlists of 6–12 months.
24–25-week antenatal visit (first pregnancy)
Blood pressure, fundal height, the baby’s movements, and the request forms for the glucose test and 28-week bloods.
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.
Coming up: 26–28-week blood tests
Full blood count (iron) and blood-group antibodies, usually drawn with the glucose test.
Coming up: Lodge the Parental Leave Pay and Family Tax Benefit claims
You can lodge up to 3 months before the due date through myGov → Centrelink.
Checklist for the week
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Questions about 25 weeks
How many months is 25 weeks pregnant?
About six months.
What trimester is 25 weeks?
Week 25 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.
Why do I get leg cramps in pregnancy?
They are common in the second and third trimesters and the cause is unclear. Stretching the calf before bed, staying hydrated and gentle exercise help; the evidence for magnesium supplements is weak.
Written by the Hello Bub team; medical schedule follows the Australian Pregnancy Care Guidelines; last reviewed 3 November 2026.