Pregnancy Week 31 is another important milestone in the third trimester. Your baby continues to grow, gain body fat and become stronger, while the brain, lungs and nervous system continue developing.
You may notice that your baby's movements have become more predictable, although they can feel different as your baby grows and has less room to move.
For you, the physical demands of pregnancy may become more noticeable. Heartburn, back discomfort, tiredness, frequent urination and difficulty sleeping are common during this stage.
What Happens During Pregnancy Week 31?
During Week 31, your baby continues gaining weight and developing body fat.
The brain is developing rapidly, and the nervous system is becoming better at coordinating different functions.
The lungs continue to mature, while the muscles and bones become stronger.
Your baby is also becoming increasingly responsive to sounds and movement.
How Big Is the Baby at Week 31?
Your baby is approximately the size of a coconut, although exact measurements vary.
Your baby will continue gaining weight during the remaining weeks of pregnancy.
As more body fat develops, the skin gradually becomes smoother and the body takes on a fuller appearance.
Baby's Movement at Week 31
You may now feel your baby's movements clearly throughout the day.
Movements can include:
- Kicks
- Punches
- Rolling
- Stretching
- Turning
- Hiccups
- Shifting
- Rhythmic movements
As your baby becomes larger, there may be less room for dramatic rolling movements.
However, your baby should continue having a regular pattern of activity.
Understanding Your Baby's Movement Pattern
Every baby has an individual pattern of movement.
Rather than comparing your baby's movements with another pregnancy, pay attention to what is normal for your baby.
If you notice a significant reduction or unusual change in your baby's normal movements, contact your maternity care provider promptly.
A noticeable change should not be ignored.
Baby's Brain Development
The brain continues to develop rapidly.
Its structure becomes increasingly complex, and connections between nerve cells continue forming.
These developments support movement, learning, sensory processing and coordination.
Brain development continues throughout pregnancy and after birth.
Baby's Hearing
Your baby's hearing continues maturing.
Your baby can hear sounds from inside your body, including your heartbeat.
External sounds may also reach your baby.
Talking, reading or singing to your baby can be a simple way to enjoy bonding during pregnancy.
Baby's Eyes
Your baby's eyes continue developing.
The eyelids can open and close, and the structures needed for vision continue maturing.
Your baby can respond to changes in light, although vision remains immature before birth.
Baby's Lungs
The lungs continue maturing during Week 31.
The structures required for breathing are developing, but the lungs are not yet fully mature.
Continued development during the third trimester helps prepare your baby for breathing after birth.
Baby's Skin and Body Fat
Your baby continues storing body fat underneath the skin.
This helps create a fuller appearance and will eventually help your baby regulate body temperature after birth.
The protective vernix coating may still cover parts of the skin.
Pregnancy Symptoms During Week 31
Common symptoms may include:
- Heartburn
- Constipation
- Bloating
- Back pain
- Pelvic discomfort
- Leg cramps
- Increased tiredness
- Difficulty sleeping
- Frequent urination
- Mild swelling
- Breast tenderness
- Increased vaginal discharge
- Occasional headaches
- Shortness of breath
Every pregnancy is different, so symptoms can vary.
Your Growing Belly
Your uterus continues expanding as your baby grows.
Your abdomen may feel heavier, and you may find certain activities more tiring.
The growing uterus can also place pressure on your bladder, which may increase the need to urinate.
Try to take regular breaks and avoid pushing yourself beyond your comfort level.
Back and Pelvic Discomfort
Changes in posture and the growing uterus can contribute to back and pelvic discomfort.
Helpful habits include:
- Maintaining good posture.
- Avoiding heavy lifting.
- Wearing comfortable supportive shoes.
- Changing positions regularly.
- Using pillows for support while sleeping.
- Taking gentle walks if appropriate.
- Practicing pregnancy-safe stretching.
Severe or persistent pain should be discussed with your healthcare provider.
Heartburn During Week 31
Heartburn can be especially noticeable during the third trimester.
You may find relief by:
- Eating smaller meals.
- Eating slowly.
- Avoiding foods that trigger symptoms.
- Staying upright after eating.
- Avoiding large meals before bedtime.
Ask your healthcare provider before using medication for heartburn.
Constipation
Constipation may continue during pregnancy because hormonal changes can slow digestion.
Helpful habits include:
- Drinking enough water.
- Eating fruits and vegetables.
- Choosing whole grains.
- Eating fiber-rich foods.
- Staying physically active if appropriate.
If constipation is severe or persistent, speak with your healthcare provider.
Leg Cramps and Swelling
Leg cramps can occur during the third trimester.
Gentle stretching and regular movement may help.
Mild swelling of the feet and ankles can also occur.
However, sudden or significant swelling, particularly when accompanied by severe headache, vision changes or upper abdominal pain, requires prompt medical assessment.
Breast Changes
Your breasts continue preparing for breastfeeding.
You may notice:
- Increased fullness
- Tenderness
- Darker areolas
- More visible veins
A comfortable supportive bra may make daily activities easier.
Nutrition During Pregnancy Week 31
Your baby continues growing rapidly, so maintaining a varied diet remains important.
Fruits and Vegetables
Include a variety of fruits and vegetables every day.
They provide vitamins, minerals, fiber and other important nutrients.
Protein
Good choices include:
- Eggs
- Chicken
- Lean meat
- Beans
- Lentils
- Tofu
- Yogurt
- Nuts
- Low-mercury fish
Whole Grains
Choose foods such as:
- Oats
- Brown rice
- Quinoa
- Whole-wheat bread
- Whole-grain cereals
Healthy Fats
Include healthy fats from:
- Avocado
- Olive oil
- Nuts
- Seeds
- Low-mercury fish
Important Nutrients
Iron
Iron supports the increased blood supply required during pregnancy.
Sources include lean meat, beans, lentils, leafy green vegetables and fortified cereals.
Calcium
Calcium supports your baby's developing bones and teeth.
Folate
Continue taking folic acid or folate according to your healthcare provider's recommendations.
Iodine
Iodine supports normal thyroid function and fetal development.
Vitamin D
Vitamin D supports bone health and calcium absorption.
Your healthcare provider can advise you about your individual prenatal supplement needs.
Staying Hydrated
Drink water regularly throughout the day.
Adequate hydration supports digestion and circulation and may help reduce constipation.
Keep water available during physical activity and hot weather.
Foods to Avoid
Continue following pregnancy food-safety recommendations.
Avoid:
- Alcohol
- Raw or undercooked meat
- Raw eggs
- Unpasteurized dairy products
- Raw shellfish
- Fish high in mercury
Wash fruits and vegetables thoroughly before eating.
Caffeine During Pregnancy
A commonly recommended limit is 200 mg of caffeine per day.
Caffeine can come from coffee, tea, chocolate, energy drinks and some medications.
Remember to consider your total intake from all sources.
Exercise During Week 31
For many women with uncomplicated pregnancies, moderate physical activity can be beneficial.
Suitable activities may include:
- Walking
- Swimming
- Prenatal yoga
- Light strength exercises
- Gentle stretching
Avoid activities that have a high risk of falling or abdominal injury.
If your healthcare provider has advised you to limit physical activity, follow their recommendations.
Sleep During Week 31
Sleep can become more challenging as your belly grows.
You may find pillows helpful for supporting your abdomen, back and legs.
A regular bedtime routine and a comfortable sleeping environment may also help.
If persistent sleep problems are affecting your daily life, discuss them with your healthcare provider.
Prenatal Care
Continue attending your scheduled prenatal appointments.
Your healthcare provider may monitor:
- Blood pressure
- Weight
- Pregnancy symptoms
- Baby's growth
- Blood tests
- Urine tests
- Medications
- Prenatal supplements
Additional tests or screenings may be recommended depending on your individual pregnancy.
Preparing for Labor
With your due date getting closer, you can gradually prepare for birth.
Consider:
- Learning about the stages of labor.
- Discussing your birth preferences.
- Asking questions about pain-relief options.
- Preparing important documents.
- Planning transportation to your maternity unit.
- Organizing essential baby supplies.
- Thinking about who will support you during labor.
Remember that your healthcare team can help you understand your available options.
Preparing for Life With a Newborn
You can also start thinking about the first weeks after birth.
Consider who might help with:
- Meals
- Household tasks
- Shopping
- Baby care
- Transportation
Having a support plan can make the transition easier.
Emotional Well-Being
As the birth approaches, it is normal to experience different emotions.
You may feel excited, nervous, impatient or uncertain.
Talk about your feelings with someone you trust.
Make time for activities that help you relax.
If persistent sadness, anxiety or fear begins interfering with your daily life, speak with a healthcare professional.
When Should You Seek Medical Help?
Contact your healthcare provider promptly if you experience:
- Heavy vaginal bleeding
- Severe abdominal or pelvic pain
- Severe persistent one-sided pain
- Fainting
- Significant dizziness
- Fever
- Fluid leaking from the vagina
- Severe vomiting
- Unusual vaginal discharge with a strong odor
- Sudden significant swelling
- Severe headache
- Vision changes
- A significant reduction or concerning change in fetal movement
- Sudden or severe difficulty breathing
Do not ignore severe or unusual symptoms during pregnancy.
Pregnancy Week 31 Checklist
- Continue your recommended prenatal supplement.
- Eat a varied and nutritious diet.
- Drink enough water.
- Eat fiber-rich foods.
- Get adequate rest.
- Stay active if appropriate.
- Avoid alcohol and tobacco.
- Keep caffeine within recommended limits.
- Attend your prenatal appointments.
- Pay attention to your baby's usual movement pattern.
- Start preparing for labor.
- Organize important baby supplies.
- Plan support for the weeks after birth.
- Make time for relaxation and emotional well-being.
Frequently Asked Questions
How big is the baby at Week 31?
The baby is approximately the size of a coconut, although exact measurements vary.
Can I feel my baby moving at Week 31?
Yes. Your baby's movements should generally remain noticeable, although they may feel different as the baby grows.
Why do my baby's movements feel different?
As your baby becomes larger, there is less space for large movements. You may notice more kicks, stretches and shifting.
Can my baby hear me at Week 31?
Yes. Your baby can hear sounds from inside your body, and external sounds can also reach the uterus.
Are fetal hiccups normal?
Fetal hiccups can feel like rhythmic movements in one area of your abdomen and are generally a normal part of fetal development.
Are the baby's lungs fully developed at Week 31?
No. The lungs continue to mature throughout the third trimester.
What should I eat during Week 31?
Choose a varied diet containing vegetables, fruits, whole grains, protein-rich foods, healthy fats and calcium-rich foods, along with your recommended prenatal supplement.
Conclusion
Pregnancy Week 31 is a time of continued growth and preparation. Your baby is gaining body fat and becoming stronger while the brain, lungs, eyes, hearing and nervous system continue to mature.
You may now have a clearer sense of your baby's usual movement pattern. Although the type of movement may change as your baby grows, a significant reduction or unusual change should be reported to your maternity care provider.
Your body is also experiencing increasing physical demands. Heartburn, constipation, back pain, pelvic discomfort, tiredness, frequent urination, swelling and sleep difficulties can occur during this stage.
Continue focusing on balanced nutrition, hydration, appropriate physical activity, rest and regular prenatal care.
As your due date approaches, gradually preparing for labor, newborn care and the first weeks at home can help you feel more confident and organized.
Every pregnancy is unique. If you experience heavy bleeding, severe pain, significant swelling, severe headache, vision changes, fluid leakage, sudden breathing difficulties or a concerning change in your baby's movements, contact your healthcare provider promptly.
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