Pregnancy week 25: symptoms, baby size and tips
Somewhere around this week your belly stops being something you can ignore. It goes hard, it feels heavy at the end of the day, and strangers start asking when you’re due. That’s 25 weeks: your baby is about the size of a cauliflower and roughly 700 g, and your body is working hard to keep up ❤️.
Coming from week 24? Then you’ve already crossed the viability line — this week is mostly about growing and getting your bearings back. If you want the whole picture, our pregnancy week by week guide has every week in order.
Your belly at 25 weeks: tight, hard and heavy
The top of your uterus (the fundus) now sits at or just above your belly button, which is why your bump suddenly looks like a proper pregnancy bump rather than “a big lunch”. Everything you’re feeling is usually just mechanics.
Why your belly feels tight or hard
A hard, tight bump that comes and goes is usually Braxton Hicks: practice contractions, irregular, painless, and they ease off if you change position, walk around or drink water. They’re more noticeable from now on because your uterus is bigger and more irritable.
What isn’t Braxton Hicks: contractions that come regularly, get closer together and stronger, and don’t stop when you rest. At 25 weeks those need a phone call, not a wait-and-see.
Belly button pain and soreness
It’s common and rarely serious. The skin around the navel stretches, the muscles separate slightly (diastasis recti) and the belly button can flatten or pop out. If the pain is sharp and one-sided, or comes with redness or fever, get it checked — that’s not the usual stretching.
”My bump looks small at 25 weeks”
Bump size is not a measurement, it’s a shape. Height, torso length, abdominal muscle tone, first pregnancy versus third — all of it changes how much you show. What your midwife actually measures is the fundal height in centimetres, and if that tracks along your curve, the size of your bump is irrelevant.
How many months is 25 weeks pregnant?
You’re in your sixth month, in the second trimester. The sixth month runs from week 22 to week 26, and the second trimester from week 13 to week 28 — so you’re three weeks away from the third.
| Weeks | Month of pregnancy | Trimester |
|---|---|---|
| 22-26 | Sixth month | Second |
| 27-31 | Seventh month | Third |
| 32-35 | Eighth month | Third |
| 36-40 | Ninth month | Third |
Pregnancy months are four and a half weeks long, not four, which is exactly why the maths never seems to work out. 25 weeks is six months just started, or about five and a half months since conception. If counting isn’t your thing, the pregnancy wheel gives you the date and the week in one go, and the weeks calculator tells you where you are today.
Your baby at 25 weeks: weight in kg and length
Expect roughly 660-700 g (about 1 lb 7 oz) and 34-35 cm head to heel. From here on the gain is steep — around 100-150 g a week — because most of what’s being laid down now is fat and muscle.
| Week | Length (head to heel) | Weight |
|---|---|---|
| 24 | 30 cm | 600-660 g |
| 25 | 34-35 cm | 660-700 g |
| 26 | 35-36 cm | 750-850 g |
These are averages from growth charts (Hadlock and similar), and a baby on the 10th percentile is not a sick baby. Your team looks for consistent growth along your own curve, not for a specific number on a specific day.
”25 weeks pregnant: symptoms of a boy or girl” — does it mean anything?
This one comes up in search every single week, so let’s be clear: no. There is no symptom at 25 weeks — heartburn, acne, cravings, how you’re carrying, the shape of your bump — that tells you the sex of your baby. The old wives’ tales (girls “steal your beauty”, boys make you carry low) have been tested and they don’t hold up. The only reliable ways to know are a scan where the genitals are visible, NIPT or amniocentesis.
Same goes for the linea nigra, that dark line down the middle of your belly: it’s caused by pregnancy hormones stimulating melanin, not by the baby’s sex. It fades after birth.
Baby movements at 25 weeks
By now most people feel their baby every day, and the movements are stronger and more organised: rolls, jabs, the occasional rhythmic hiccup that feels like a twitch every second or two for a few minutes.
”My baby is moving a lot” — is that a problem?
Usually not. Some babies are simply busy, and there’s no evidence that a very active baby means anything is wrong. What matters is that the pattern stays familiar to you.
”My baby’s movements have slowed down”
This is the one to take seriously. Don’t wait for the next appointment and don’t use a home doppler to reassure yourself. Lie on your left side, have something cold to drink, and see if your baby responds within an hour or two. If the movements are clearly reduced compared with your normal pattern, call your maternity unit the same day. Most of the time everything is fine — but reduced movements are one of the few things in pregnancy where checking is always the right call.
Does an anterior placenta change what I feel?
Yes, and it’s normal. If the placenta is on the front wall of the uterus, it acts as a cushion between your baby and your belly, so kicks feel softer and later. It doesn’t affect your baby’s health, only how much you feel.
Baby position at 25 weeks: head down, breech or sideways?
At 25 weeks your baby still has plenty of room, so position means almost nothing yet. Breech (bottom first), transverse (sideways) and head down can all change within a day or two. Most babies settle head down between 32 and 36 weeks.
That said, if you’re feeling a lot of kicking low down and pressure on your bladder, your baby may be head up for now. Enjoy the space while it lasts: from around 30 weeks the acrobatics get harder.
If your baby arrived now: what 25-week prematurity means
At 25 weeks a baby can survive outside the womb, but only with neonatal intensive care, and the road is long. Lungs are the main problem: the air sacs are still developing and surfactant production is just starting, so most babies this early need breathing support. They also struggle to hold their temperature, feed and coordinate suck-swallow-breathe.
Two honest points:
- Survival and outcomes vary enormously by hospital, birth weight, infection, and whether there was time for antenatal steroids. Anyone who gives you a single reassuring percentage is oversimplifying.
- Weeks matter enormously. The difference in maturity between 25 and 28 weeks is huge, which is why if you ever go into threatened preterm labour, the goal is to buy days: steroids for the lungs, medication to slow contractions, transfer to a unit with a NICU if needed.
And the reassuring part: being potentially viable doesn’t mean your baby will come early. The vast majority of pregnancies at 25 weeks carry on to near term.
Symptoms you might notice this week
- Heartburn and reflux, worse after big meals or lying flat.
- Shortness of breath on stairs or in long conversations.
- Leg cramps at night and swollen ankles by evening.
- Back pain and round ligament twinges when you stand up too fast.
- Carpal tunnel symptoms: numb or tingling fingers, especially at night.
- More vaginal discharge — normal if it’s whitish and not smelly.
- Constipation and haemorrhoids, both driven by progesterone and iron supplements.
- Braxton Hicks, more noticeable than last month.
When to call your midwife or maternity unit
Call the same day, not next week, if you have:
- Contractions that are regular (every 10 minutes or less) and don’t settle with rest.
- Any fluid leaking from the vagina, or a feeling that something has ruptured.
- Bleeding, with or without pain.
- A severe headache with swelling of hands or face, or blurred vision — possible pre-eclampsia.
- A temperature above 38 °C or chills.
- Reduced baby movements that don’t return to normal.
- Pain in one side of your belly, in your shoulder tip, or burning when you pee.
No one will think you’re wasting their time. That’s what the unit is for.
What to sort out this week
- Book the glucose test if it isn’t booked: it’s done between 24 and 28 weeks to screen for gestational diabetes, which usually has no symptoms.
- Ask about the whooping cough (pertussis) vaccine. Timing depends on where you live — in the UK it’s offered from around 20 weeks, in Spain between 27 and 36 — and it protects your baby in the first months of life.
- Start the pelvic floor habit: short squeezes, several times a day. It pays off in labour and after birth.
- Sort your sleep setup: side sleeping with a pillow between your knees takes pressure off your back and hips.
- Iron and fibre: if your supplement is making you constipated, tell your midwife rather than stopping it silently.
- Write your questions down. Appointments are short and the good questions always arrive in the car park afterwards.
If you want to pass the time or settle a doubt, our free online pregnancy test quiz is a symptom-based questionnaire, and the finger pregnancy test game is exactly what it sounds like: a bit of fun, not a real test.
FAQ
How many months is 25 weeks pregnant? Six months, in the second trimester. The sixth month runs from week 22 to 26. It’s about five and a half months since conception.
How much does a baby weigh at 25 weeks? Typically 660-700 g (around 1 lb 7 oz), with a length of 34-35 cm. There’s a normal range either side of that.
What size is a 25-week fetus? About the size of a cauliflower. Fruit-and-veg comparisons are rough guides only; the centimetres and the growth curve matter more.
Can a baby survive being born at 25 weeks? Yes, with intensive care — but it’s a very premature baby with a high risk of complications and long-term problems. Outcomes depend on the hospital, weight, infection and whether steroids were given in time.
Is a tight, hard belly at 25 weeks normal? Usually yes: those are Braxton Hicks. Regular, painful contractions that get closer together are not, and need a call.
Can you tell if it’s a boy or girl from symptoms at 25 weeks? No. Cravings, heartburn, acne and bump shape don’t predict sex. Only a scan, NIPT or amniocentesis can.
Why have my baby’s movements got weaker? An anterior placenta cushions them, and so does your baby’s position. But a clear reduction in your baby’s normal pattern is a reason to call your unit today, not to wait.
Is it normal to feel the baby kick low down at 25 weeks? Yes. If your baby is head up for now, kicks land low and on your bladder. Position at 25 weeks changes constantly and only matters from around 32-36 weeks.
Every pregnancy is different and this article is general information, not medical advice. If something worries you, speak to your midwife, GP or maternity unit — and enjoy this stretch while your energy is still decent ❤️.
Sources
- NHS — 25 weeks pregnant
- NHS — Your baby’s movements
- NHS — Pre-eclampsia
- MedlinePlus — Fetal development
- ACOG — How your fetus grows during pregnancy
- ACOG — Preterm labor and birth
- WHO — Preterm birth
This article is for information only and does not replace the assessment of your midwife or doctor. If you have any concerns about your pregnancy, always contact a healthcare professional ❤️.
