31 Weeks Pregnant is part of the third trimester. At 31 weeks pregnant, baby is gaining weight quickly, movement may feel strong, Braxton Hicks contractions may happen, and your body may feel heavier as the final weeks continue.
31 Weeks Pregnant: Symptoms, Baby Development, and What to Expect
At 31 Weeks Pregnant, your baby is about the size of a coconut, baby is getting plumper, movements may include kicks, rolls, stretches, and turns, and third trimester symptoms like backache, heartburn, swelling, Braxton Hicks, and trouble sleeping may become more noticeable.
What Does 31 Weeks Pregnant Mean?
31 Weeks Pregnant means you are thirty-one weeks into the pregnancy timeline, counted from the first day of your last menstrual period. You are in the third trimester, and baby is still growing, gaining fat, and preparing for birth.
At 31 Weeks Pregnant, baby may feel very active at certain times of day. You may notice stronger kicks, rolls, stretches, turns, or pressure as your baby moves. Your belly may feel heavier, and symptoms like tiredness, heartburn, backache, Braxton Hicks contractions, swelling, and sleep problems may be more obvious.
The NHS says that at 31 weeks, baby is around 41.1 cm long from head to heel, about the size and weight of a coconut. The NHS also says your baby is very active, moving around, sucking their fingers, and doing the odd somersault. NHS
At 31 Weeks Pregnant, your provider may also discuss third trimester visits, baby movement, sleep position, swelling, Braxton Hicks contractions, heartburn, itching, birth planning, vaccines, and which symptoms should be reported right away.
31 Weeks Pregnant Baby Size
At 31 Weeks Pregnant, baby is about the size and weight of a coconut according to the NHS. The NHS gives a measurement of around 41.1 cm from head to heel. NHS
Size comparisons can vary by pregnancy guide, but a coconut is the week-specific comparison from the NHS. The main point is that baby is growing, gaining fat, and continuing to mature.
At 31 Weeks Pregnant, baby is still premature, but each week helps the brain, lungs, feeding ability, immune system, body temperature control, and overall strength continue to develop.
Simple explanation: At 31 Weeks Pregnant, baby is about the size and weight of a coconut according to the NHS and measures around 41.1 cm from head to heel.
31 Weeks Pregnant Baby Development
At 31 Weeks Pregnant, baby development is focused on fast weight gain, movement, fat storage, nervous system development, and continued lung maturity. ACOG says that during weeks 29 to 32, the fetus can stretch, kick, and make grasping motions. ACOG also says the eyes can sense changes in light, bone marrow is forming red blood cells, and lanugo begins to disappear. ACOG
Mayo Clinic says that at week 31, your baby has finished most major development and now it is time to gain weight quickly. Mayo Clinic
The NHS says baby is getting plumper and looking less wrinkled day by day. The NHS also explains that the amount of amniotic fluid around baby is increasing because baby is now able to pee. NHS
At 31 Weeks Pregnant, baby may sleep, wake, kick, roll, stretch, suck their fingers, respond to sounds, swallow amniotic fluid, practice breathing movements, and have active and quiet times. Baby still needs more time in the womb for the brain, lungs, immune system, feeding reflexes, and temperature control to mature.
31 Weeks Pregnant Symptoms
31 Weeks Pregnant symptoms may feel more intense because your belly is growing and the third trimester is underway. Your uterus is higher, baby is taking up more room, and your back, hips, ribs, pelvis, legs, and lower belly may all feel more pressure.
The NHS lists common symptoms at 31 weeks, including sleeping problems, stretch marks, swollen and bleeding gums, round ligament pains, piles, headaches, backache, indigestion and heartburn, bloating and constipation, leg cramps, feeling hot, dizziness, swollen hands and feet, urine infections, vaginal infections, darker skin patches, greasier or spotty skin, thicker and shinier hair, mood swings, cravings, heightened sense of smell, sore or leaky breasts, and white milky discharge or light spotting that should be checked if there is bleeding. NHS
You may also notice occasional belly tightening. The NHS explains that Braxton Hicks contractions may feel like your bump tightens for 20 to 30 seconds and then relaxes. They should not hurt, but painful contractions or contractions that come at regular intervals should be checked because they could be a sign of early labor. NHS
- A growing belly or tighter clothing.
- Backache, hip discomfort, rib discomfort, or pelvic pressure.
- Shortness of breath or feeling winded more easily.
- Bloating, constipation, indigestion, heartburn, or piles.
- Headaches, dizziness, nosebleeds, or bleeding gums.
- Leg cramps, feeling hot, or trouble getting comfortable at night.
- Swollen feet, ankles, hands, or fingers.
- Braxton Hicks contractions or occasional belly tightening.
- White milky discharge, mild cramping, or occasional light spotting for some women.
- Stronger rolls, taps, kicks, turns, stretches, or nudges.
31 Weeks Pregnant Baby Movement
At 31 Weeks Pregnant, many women feel baby move clearly. Movements may feel like kicks, rolls, taps, nudges, stretches, turns, little punches, swishes, or pressure as baby shifts position.
By 31 Weeks Pregnant, you may know your baby’s normal active times. Movement may be more noticeable after meals, when you are resting, or when you lie down at night. Baby can also have sleep and wake patterns that do not always match your schedule.
Tommy’s says feeling your baby move is a sign that they are well, and you should contact your maternity unit immediately if baby is moving less than normal, movements feel weaker than normal, baby has stopped moving, or you just think something is wrong. Tommy’s
31 Weeks Pregnant Cramping
Mild cramping at 31 Weeks Pregnant can happen. Your uterus is growing, ligaments are stretching, and digestion may still be slower because of pregnancy hormones.
Some women feel pulling, stretching, or side pains around this time. Occasional mild tightening can also happen. However, severe pain, regular tightening, or cramping that feels different from your normal should be checked.
Call your doctor right away if cramping is severe, one-sided, comes with heavy bleeding, shoulder pain, dizziness, fainting, fever, leaking fluid, regular tightening, pelvic pressure, or pain that feels very different from normal pregnancy discomfort.
31 Weeks Pregnant Spotting
Some women have light spotting at 31 Weeks Pregnant. Light spotting does not always mean something is wrong, but bleeding during pregnancy should still be mentioned to your healthcare provider.
If spotting becomes heavy, bright red, painful, or comes with dizziness, shoulder pain, one-sided pelvic pain, leaking fluid, regular contractions, pelvic pressure, or severe cramping, call your doctor quickly.
Your provider may recommend monitoring, an exam, bloodwork, or an ultrasound depending on your symptoms. It is better to call and ask than to guess.
31 Weeks Pregnant Appointments
At 31 Weeks Pregnant, prenatal visits may be happening more often because you are in the third trimester. Your provider may check your blood pressure, weight, urine, belly measurement, baby’s heartbeat, swelling, symptoms, and any concerns you have.
Cleveland Clinic says prenatal visits in the third trimester are usually scheduled more frequently to check the health of the fetus, and typical checks may include blood pressure, weight, fundal height, fetal heart rate, urine, and vaccine guidance. Cleveland Clinic
The NHS says the RSV vaccine is usually offered around week 28 but can be given later if needed, right up until labor. Ask your own provider what vaccine timing applies to your country, season, medical history, and pregnancy. NHS
This is a good week to ask about baby movement, swelling, sleep position, back pain, travel rules, work restrictions, vaccine timing, birth classes, preterm labor symptoms, itching, and when to call the office or hospital.
31 Weeks Pregnant Third Trimester
31 Weeks Pregnant is in the third trimester. Cleveland Clinic describes the third trimester as the final months of pregnancy, when the fetus gains weight more rapidly and organs mature to prepare for birth. Cleveland Clinic
The third trimester can bring more physical pressure, stronger movement, more frequent appointments, and more focus on birth preparation. It can also bring more emotions because the due date starts to feel closer.
Even though 31 weeks is an exciting milestone, baby still benefits from more time to grow and mature. The brain, lungs, body fat, feeding reflexes, and temperature control are still developing.
31 Weeks Pregnant Sleep and Comfort
At 31 Weeks Pregnant, sleep may become harder. Your belly is bigger, your hips may ache, heartburn may be worse, and baby may feel more active when you are trying to rest.
Tommy’s says that in the third trimester, going to sleep on your side has been shown to be safest for your baby, including daytime naps. If you wake up on your back, turn back onto your side and try not to panic. Tommy’s
If lying flat makes you feel dizzy, short of breath, faint, or uncomfortable, change positions and let your provider know. Pillows, side sleeping, smaller meals at night, and resting when you can may help.
31 Weeks Pregnant Braxton Hicks and Itching
At 31 Weeks Pregnant, Braxton Hicks contractions may feel like your belly gets tight and then relaxes. They are often irregular and may ease with rest, fluids, or changing positions.
Regular contractions, painful contractions, pressure that feels like labor, bleeding, leaking fluid, or cramping that keeps coming should be checked right away because it could be a sign of preterm labor.
Itching can also happen in pregnancy as the skin stretches. Tommy’s explains that itching is common, but itching that is worse at night, especially on the hands and feet and without a rash, can sometimes be a sign of intrahepatic cholestasis of pregnancy. Contact your midwife or doctor if itching worries you or feels unusual. Tommy’s
31 Weeks Pregnant Ultrasound
At 31 Weeks Pregnant, not everyone has an ultrasound. Some pregnancies may have growth scans, placenta checks, follow-up anatomy images, fluid checks, or other ultrasounds depending on medical history and provider preference.
Baby may move, kick, stretch, turn, open and close the eyes, or change position during a scan. Sometimes baby’s position makes it hard to get every image, and that does not automatically mean something is wrong.
Your provider will explain what they see based on baby’s measurements, your dates, placenta location, amniotic fluid, and your medical history.
31 Weeks Pregnant Body Changes
At 31 Weeks Pregnant, your belly may feel heavier and your posture may be changing. Your lower back may work harder, your hips or pelvis may feel more pressure, and you may need more breaks during the day.
Digestion may still be slower, causing bloating, constipation, piles, and heartburn. Drinking fluids, eating fiber-rich foods, moving gently if approved, and asking your provider about safe options may help.
You may also notice skin stretching, more visible veins, breast changes, leg cramps, trouble sleeping, swelling, occasional belly tightening, or stronger baby movement. These can happen in pregnancy, but severe pain, heavy bleeding, leaking fluid, regular tightening, or movement concerns should be checked right away.
What to Do at 31 Weeks Pregnant
If you are 31 Weeks Pregnant, keep up with prenatal care and ask what appointments, vaccines, or tests are coming next. This may include Tdap timing, RSV vaccine timing depending on your provider and season, growth monitoring if needed, and third trimester appointment planning.
The NHS says week 31 can be a good time to think about safe baby slings and carriers, baby sleep items, pelvic floor exercises, antenatal classes, and talking to your work if you have not already done so. NHS
You may want to ask your provider about movement expectations, swelling, sleep position, safe exercise, travel rules, work concerns, itching, back pain relief, preterm labor signs, and which symptoms should be reported right away.
- Confirm your next prenatal appointment.
- Ask about Tdap, RSV vaccine timing, and any third trimester testing that applies to you.
- Ask about baby movement patterns and when to call.
- Start or update a simple hospital bag list.
- Think about safe sleep supplies and newborn basics.
- Check whether antenatal or childbirth classes are available.
- Drink fluids and eat balanced meals when possible.
- Call your provider for bleeding, severe pain, leaking fluid, regular tightening, itching concerns, or movement concerns.
What to Eat at 31 Weeks Pregnant
At 31 Weeks Pregnant, balanced meals with protein, fruits, vegetables, whole grains, healthy fats, and fluids can help support your body during the third trimester.
The third trimester can bring more heartburn and constipation, so smaller meals, slower eating, fluids, fiber-rich foods, and avoiding lying down right after eating may help. Ask your provider before taking medicines, supplements, or stool softeners.
If you have gestational diabetes, anemia, high blood pressure, severe nausea, vomiting, or a restricted diet, follow your provider’s nutrition guidance instead of general advice.
What Not to Worry About Too Much at 31 Weeks Pregnant
It is normal to feel emotional at 31 Weeks Pregnant. You may feel excited, nervous, impatient, tired, uncomfortable, or worried about birth. The third trimester can make everything feel more real.
Movement may have active and quiet times, but you should still pay attention to what is normal for your baby. If movement seems clearly reduced, weaker, stopped, or different, call your provider right away.
Try not to compare your bump, symptoms, movement pattern, scan results, or energy level to someone else’s. Every pregnancy has its own pattern.
When to Call Your Doctor at 31 Weeks Pregnant
Most mild symptoms at 31 Weeks Pregnant can be normal, but some symptoms should be checked quickly. Trust your instincts if something feels severe, unusual, or unsafe.
Call your doctor right away for heavy bleeding, severe cramping, one-sided pelvic pain, shoulder pain, dizziness, fainting, fever, leaking fluid, regular tightening, strong pelvic pressure, vomiting that keeps you from holding down fluids, sudden swelling, severe headache, vision changes, chest pain, severe shortness of breath, severe itching, or movement that seems clearly reduced from your baby’s normal pattern. This page is for general education and does not replace medical care.
31 Weeks Pregnant Summary
31 Weeks Pregnant is part of the third trimester. At 31 weeks pregnant, baby is about the size and weight of a coconut according to the NHS, baby is getting plumper, major development is mostly complete, and fast weight gain is beginning.
The most important things to know about 31 Weeks Pregnant are simple: baby movement matters, Braxton Hicks may happen, sleep may be harder, third trimester appointments may continue, and it is time to pay close attention to symptoms like bleeding, leaking fluid, regular tightening, severe pain, swelling, itching, chest pain, shortness of breath, or movement changes.
If you are 31 Weeks Pregnant, keep taking care of your body, stay in contact with your healthcare provider, and call right away for heavy bleeding, severe pain, leaking fluid, regular tightening, dehydration, itching concerns, movement concerns, or symptoms that worry you.