25 Weeks Pregnant: Symptoms, Baby Development and What to Expect

At 25 weeks pregnant you are about 6 months along, in the second trimester, with about 15 weeks to go until your estimated due date.

At 25 weeks pregnant your baby may react to your voice, your bump is probably obvious, and your glucose screening is likely coming up.

This guide covers months, development and size, symptoms, tests and vaccines, sleep, and the warning signs that mean you should call. Every clinical detail was checked in October 2026 on the sources named in the text.

25 Weeks Pregnant at a Glance

How the weeks are counted. Mayo Clinic explains that providers count 40 weeks from the start of your last period, so you are not actually pregnant for the first week or two. Cleveland Clinic says that date is about two weeks ahead of conception. That is why Mayo Clinic describes week 25 as 23 weeks after conception. If an early ultrasound changed your due date, go by the adjusted dates.

How many months is 25 weeks pregnant? Twenty-five weeks is 175 days, a little under 5 3/4 calendar months from the first day of your last period, so most people say about 6 months, in the 6th month. You may also see week 25 called month 7: Cleveland Clinic’s guide uses four-week months and places weeks 25 through 28 in month 7. Both are just ways of grouping weeks, which is why your provider counts in weeks.

Your Baby’s Development at 25 Weeks

These are the changes Mayo Clinic and Cleveland Clinic tie to week 25 and the weeks around it. Babies develop on their own timelines, so read them as general patterns.

When do the lungs start making surfactant? Sources differ. Mayo Clinic says the lungs start making surfactant, which lets the air sacs inflate, at week 23. Cleveland Clinic says the lungs begin producing it at week 26. Development is gradual, so references often date it a little differently.

How Big Is Your Baby at 25 Weeks?

Mayo Clinic does not give a week 25 measurement, so here are its week 24 and week 26 figures, plus Cleveland Clinic’s range for month 7.

Mayo Clinic measures crown to rump, from the top of the head to the bottom of the tailbone, which leaves out the legs. Cleveland Clinic’s figure covers a whole four-week stretch and does not say how it is measured. We have not converted any numbers, and we found no week 25 fruit comparison on a primary medical source. Healthy babies vary in size.

25 Weeks Pregnant Symptoms

Mayo Clinic says many people have more energy in the second trimester, but the growing uterus brings new aches. You may have several of these, or very few.

• Dizziness: Mayo Clinic says to drink fluids, move slowly and lie down on your side when you feel dizzy. The CDC lists fainting as an urgent warning sign.
• Stuffy nose and bleeding gums: saline drops or a rinse can help the nose; a softer toothbrush and salt water rinses can help gums (Mayo Clinic).
• Signs of a urinary tract infection: an urgent need to pee, sharp pain when urinating, cloudy urine, fever or backache need a call (Mayo Clinic).

Your mood counts too. UPMC lists anxiety among second trimester changes and says to talk to your doctor if it makes it hard to sleep or enjoy life. Mayo Clinic says your care team can refer you to a counselor.

Your Body and Belly at 25 Weeks

Most people have a clear bump by now, but the range of normal is wide. UPMC lists a baby bump and larger breasts among second trimester changes. Our pregnant belly by month guide shows the usual progression.

• Fundal height: UPMC says providers start measuring it around week 24, from your pubic bone to the top of your uterus, to track growth.
• Appetite: UPMC says you need about 340 more calories a day in the second trimester. Ask your provider what weight gain range fits you.
• Breasts: a bra with wide straps or a supportive sports bra helps (Mayo Clinic).

Feeling your baby move. UPMC says most people feel movement around 20 weeks, so by 25 weeks many people notice it often. Learn your baby’s usual pattern: the CDC lists movement stopping or slowing as an urgent warning sign.

Prenatal Care, Tests and Appointments Around Week 25

UPMC says second trimester visits are usually every four weeks, with a weight and blood pressure check and a urine sample. Mayo Clinic says you may hear your baby’s heartbeat at visits.

If the glucose result is high. UPMC says you will need a second test to confirm or rule out gestational diabetes, so one high screening result is not a diagnosis. Ask your clinic how to prepare.

Why Tdap waits until week 27. The CDC says your body makes antibodies after the shot and passes high levels to your baby before birth, protecting them until their own vaccines start at two months. Ask now when your clinic gives it.

Vaccines change. As of October 2026, Mayo Clinic also advises a COVID-19 vaccine if you have not had one. Confirm every vaccine with your provider.

What to Do This Week: A Simple Checklist

• Book or confirm your glucose screening for weeks 24 to 28 (UPMC).
• Ask when your clinic gives Tdap (CDC: 27th through 36th week).
• Sign up for a childbirth class and start a birth plan, both on UPMC’s to-do list.
• Talk to your employer about parental leave (UPMC).
• Swap high heels for low-heeled, supportive shoes (Mayo Clinic).
• Start your baby registry checklist while energy is good.

Sleep at 25 Weeks Pregnant

MedlinePlus says sleep gets harder later in pregnancy: a bigger baby makes positions awkward, and bathroom trips, aches, heartburn and night movement add up.

Sleep position. MedlinePlus does not tie this to a specific week. It says lying on your side with your knees bent is likely most comfortable, many providers suggest the left side, and it is best not to sleep flat on your back.

• Pillows: under your belly or between your legs (MedlinePlus). See how to use a pregnancy pillow.
• Evenings: cut back on caffeine and avoid big meals or lots of fluid within a few hours of bed (MedlinePlus).
• Night leg cramps: press your feet firmly against the wall (MedlinePlus).

Sleep aids. MedlinePlus says not to take any, including over-the-counter and herbal products, without asking your provider. Read can you take melatonin while pregnant.

For Partners: How to Help at 25 Weeks

• Talk or read to the bump. Mayo Clinic says the baby might respond to familiar voices at week 25.
• Keep her company at the glucose test, which includes a one hour wait (UPMC).
• Take over the heavy lifting.
• Learn the warning signs below so you can make the call if she is unsure.

Looking Ahead: What Comes Next

• Week 26: eyebrows and eyelashes have formed (Mayo Clinic). See 26 weeks pregnant.
• Week 27: the end of the second trimester (Mayo Clinic) and the start of the Tdap window. See 27 weeks pregnant.
• Week 28: the glucose window closes (UPMC) and the third trimester begins by the ACOG definition.

Looking back? Read 23 weeks pregnant and 24 weeks pregnant.

Related Betteroo Guides

• 24 Weeks Pregnant
• 26 Weeks Pregnant
• 27 Weeks Pregnant
• Second Trimester Guide
• Third Trimester Guide
• How to Use a Pregnancy Pillow

When to Call Your Provider

Preterm labor. March of Dimes defines preterm labor as labor before 37 weeks and says to call your provider right away if you have even one of these:

• Regular or frequent contractions that make your belly tighten like a fist.
• A change in vaginal discharge (watery, mucus or bloody), or more than usual.
• Pressure in your pelvis or lower belly, like your baby is pushing down.
• A constant low, dull backache, or belly cramps with or without diarrhea.
• Your water breaks. See signs of leaking amniotic fluid.

Urgent maternal warning signs. The CDC says to seek medical care immediately for any of these, and to say you are pregnant:

• Vaginal bleeding or fluid leaking, or severe belly pain that does not go away.
• Your baby’s movement stopping or slowing.
• A headache that will not go away or gets worse, or vision changes. UPMC says these can signal preeclampsia.
• Extreme swelling of your hands or face.
• Dizziness or fainting, or a fever of 100.4 F or higher.
• Trouble breathing, chest pain or a fast-beating heart.
• Severe swelling, redness or pain in a leg or arm.
• Thoughts about harming yourself or your baby.

The CDC says these can signal a life-threatening condition. If you cannot reach your provider quickly, go to the nearest emergency room, and call 911 for an emergency such as fainting, chest pain or heavy bleeding. This article is general education, not medical advice.

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