Pregnancy Week 31: Continued Growth and Weight Gain
Pregnancy week 31 continues the third trimester, a stage when your baby is growing quickly and gaining weight in preparation for birth. As the weeks progress, your baby’s body is becoming stronger and more developed.
During this stage, many women notice their baby moving frequently throughout the day. Kicks, stretches, and rolling movements may feel stronger as your baby continues building muscle strength and coordination.
Your body is also continuing to adapt to support your baby’s development. As your baby grows larger, you may begin experiencing some new physical sensations as your body prepares for the final weeks of pregnancy.
Although some symptoms may feel uncomfortable, they are typically a normal part of the third trimester and are signs that your body is preparing for delivery.
Baby Development at Week 31
At thirty-one weeks pregnant, your baby is about the size of a coconut and continues growing steadily each week.
Your baby is continuing to gain weight as fat builds beneath the skin. This fat helps your baby regulate body temperature after birth and supports healthy development.
Your baby’s brain is also developing rapidly during this stage. The brain is forming new connections that support learning, movement, and sensory development.
Your baby’s lungs continue maturing as well. Although the lungs are still developing, they are gradually preparing for breathing after birth.
Your baby’s movements may feel stronger and more coordinated as muscles and bones continue strengthening.
Many babies also develop more regular sleep and wake cycles during this stage of pregnancy. However, these cycles may not always match your own sleep schedule.
Common Symptoms During Week 31
Common experiences during week 31 include:
Shortness of breath
Leg cramps
Back discomfort
Fatigue
Stronger baby movements
Shortness of breath may occur because the growing uterus places pressure on the diaphragm and lungs.
Leg cramps are also common during the third trimester, especially at night. These cramps may occur as muscles work harder to support the changing body.
Although these symptoms can be uncomfortable, they are usually temporary and manageable with simple lifestyle adjustments.
Changes in Your Body
Your uterus continues expanding upward as your baby grows larger.
Your abdomen may feel heavier and firmer compared to earlier weeks. This change is a natural result of your baby’s continued growth.
Your center of gravity may shift slightly forward as your baby bump becomes more noticeable. This shift can affect posture and balance.
Your body is also increasing blood circulation to supply oxygen and nutrients to your baby through the placenta.
Some women may notice mild swelling in the feet, ankles, or hands due to increased blood flow during pregnancy.
Understanding Baby Movements
By week 31, many babies move frequently throughout the day.
You may begin recognizing patterns in your baby’s activity. Some babies are more active in the evening or after meals.
Feeling regular movement can provide reassurance that your baby is developing normally.
Every baby has unique movement patterns during pregnancy.
Helpful Tips for Week 31
Stretch gently to reduce muscle tension
Stay hydrated throughout the day
Rest when needed
Continue gentle exercise such as walking
Gentle stretching before bed may help reduce leg cramps during the night.
Staying hydrated also supports circulation and helps your body function properly during pregnancy.
Track Your Pregnancy Progress
Track your pregnancy week and milestones here:
This tool helps you understand your pregnancy stage, trimester timeline, and estimated due date.
Preparing for the Final Weeks
As the third trimester continues, many parents begin preparing more actively for their baby’s arrival.
This may include organizing baby essentials, preparing a sleeping space for the baby, and learning about newborn care.
Helpful guides and resources can be found here:
Understanding what to expect during the final weeks of pregnancy can help you feel more confident and prepared for your baby’s arrival.