What pregnancy week 25 means
Filling out. “25 weeks pregnant” means 25 weeks have passed since the first day of the last menstrual period — the standard way pregnancy is dated. Conception usually happened about two weeks after that date, so the baby’s own age (fetal age) is roughly 23 weeks. Week 25 runs from 25 weeks 0 days to 25 weeks 6 days; on the following day the pregnancy is 26 weeks.
Your baby at 25 weeks
The baby is building fat, so the skin is starting to smooth out. The nostrils, which were plugged, are beginning to open, and the baby is practising breathing movements with amniotic fluid.
A common way to picture it: the baby is now about the size of a cauliflower — roughly about 34 cm and about 660 g. These are averages; babies grow at different rates, and ultrasound measurements vary.
Your body at 25 weeks
Sleep can become harder to find because of the bump, leg cramps or needing the bathroom at night. Pillows between the knees and under the bump help many people.
Care and appointments around week 25
If you have Rh-negative blood, an anti-D injection is commonly offered in the third trimester; your provider will tell you whether it applies to you.
The timing of tests and appointments differs between countries and care providers. If anything worries you — such as bleeding, severe pain, fluid leaking, fever, or a change in your baby’s movements — contact your midwife, doctor or maternity unit straight away rather than waiting for your next appointment.
Week 25 in your pregnancy timeline
Week 25 is in the second trimester (weeks 14–27) and in pregnancy month 6, which covers roughly weeks 23–27. The third trimester begins in 3 weeks.
| Pregnancy start (first day of last period) | |
|---|---|
| Estimated conception | |
| Third trimester begins (28 weeks) | |
| Full term (39 weeks) | |
| Estimated due date (40 weeks) |
Dates assume you are exactly 25 weeks 0 days today. For dates based on your own last period, use the calculator above or the main Pregnancy Calculator.
25 weeks pregnant in days and months
25 weeks is 175 days of pregnancy — 63% of a 40-week pregnancy. Counted in calendar months, 25 weeks is about 5.7 months, which is usually described as month 6 of pregnancy. Months are only a rough grouping; healthcare professionals almost always talk in weeks and days because they are more precise. See Pregnancy Month Calculator for how weeks map to months.