Overview
Rapid brain development continues; baby is gaining weight steadily. The baby is adding weight and brain power quickly now, and your body often feels every bit of that progress.
Third Trimester · Weeks 28–42
Week 31 Pregnancy
Rapid brain development continues; baby is gaining weight steadily.
About the size of a coconut3 min read10 sections
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Baby Development
Rapid brain development continues, with nerve connections and sleep cycles becoming more sophisticated. The baby is gaining body fat and looking less wrinkled as the skin fills out.
Baby Size
A playful size comparison for this week is coconut. That coconut-sized baby is fuller, stronger, and increasingly ready for life outside the womb.
Mother's Body Changes
The bump may feel high and prominent, leaving less room for your stomach and lungs to feel comfortable. You might also notice leaking colostrum, more pelvic heaviness, or extra clumsiness when tired.
Common Symptoms
Week 31 often brings stronger movement, breathlessness, heartburn, swollen feet, back pain, and poor sleep. Tingling hands or numb fingers can also appear from fluid retention.
Nutrition Tips
Small, frequent meals often work better than large ones now, especially if reflux is stealing your appetite. Keep protein and calcium regular, and follow iron supplements carefully if they have been prescribed.
Exercise & Movement
Movement that creates relief is the right movement in week 31, whether that is a short walk, stretching, swimming, or supported squats. Back off if your pelvis or belly feels heavy and overworked.
Emotional Wellbeing
Feeling physically cumbersome can affect mood more than people expect. You do not need to perform gratitude every minute to still be deeply connected to your baby.
Partner Support
A partner can help by spotting when you need practical comfort rather than advice. Pillows arranged before bed or help with footwear can feel disproportionately kind right now.
Warning Signs
Urgent warning signs this week include heavy bleeding, severe abdominal pain, fever, fainting, leaking fluid, or a severe headache with vision changes. Call promptly for decreased movement, contractions that regularise, leaking fluid, bleeding, or sudden swelling with headache or visual symptoms. From week 28 onward, contact your care team promptly if the baby's usual movements slow down, weaken, or stop.
Frequently Asked Questions
Yes, a small amount can leak in the third trimester for some people. It is usually normal unless it is bloody or paired with other concerns.
ParentVibes Tip
Short, frequent rests help with growing tiredness. Short, frequent rests usually serve you better now than waiting until you are completely wiped out.
Continue your journey
Explore the full third trimester guide.
ParentVibes offers general information, not medical advice. Always follow your doctor or midwife.