Is it Normal to Poop a Lot More in the Third Trimester?

Pregnancy brings big changes—body, mood, appetite and digestion included. If you’re asking “why is my poop happening more often than usual?” you’re not alone. Many women find their bowel habits shift in the third trimester. Here’s what’s going on, why it’s usually harmless, and when to talk to your doctor.

What Changes in the Third Trimester?

During weeks 28–40, several factors can speed up—or slow down—your digestive system:

• Hormonal shifts
  • Progesterone levels peak, relaxing muscles in the uterus and gut.
  • Estrogen affects fluid balance and gut motility.
• Uterine growth
  • The baby and placenta take up more space, shifting your intestines.
  • Pressure on the rectum or colon can alter stool passage.
• Increased fluid intake
  • Many women sip more water to stay hydrated.
  • Fluids can soften stool and prompt more trips to the bathroom.
• Dietary changes
  • Cravings for fruits, smoothies and other fiber-rich foods.
  • Prenatal vitamins may include iron, magnesium or other minerals that affect stool consistency.

Common Reasons for More Frequent Bowel Movements

Here are the most likely explanations for why you’re pooping more often in late pregnancy:

1. Hormones at Work

   • Progesterone relaxes smooth muscles, speeding—or in some cases slowing—gut transit.
   • Relaxed gut muscles can lead to looser stool or mild diarrhea.

2. Uterine Pressure

   • As the baby grows, the uterus can press on your intestines.
   • You may feel the need to poop more often or have less control over timing.

3. Dietary Fiber

   • Many women increase fiber intake to prevent constipation.
   • Fiber absorbs water, bulking up stool and triggering more frequent bowel movements.

4. Prenatal Vitamins and Supplements

   • Iron supplements can cause constipation in some, but magnesium often has a laxative effect.
   • Check your vitamin formula and discuss adjustments with your provider.

5. Increased Fluids

   • Hydration softens stool, making it easier to pass.
   • More fluids generally lead to more bowel movements.

6. Gestational Diabetes

   • Rarely, hormonal disruptions can affect blood sugar and digestion.
   • If you’ve been diagnosed with gestational diabetes, changes in gut function can occur.

Should You Worry?

In most cases, extra pooping in the third trimester is normal and even helpful. It’s better to have loose stools than suffer from constipation and risks such as hemorrhoids. However, watch for warning signs that warrant medical attention:

• Blood in your stool or rectal bleeding
• Severe abdominal pain or cramping
• Fever or chills
• Dehydration (dizziness, dry mouth, dark urine)
• Mucus in stool or a sudden, intense urge that won’t subside
• Signs of infection (unusual discharge, burning with urination)

If you experience any of these, speak to your doctor right away.

Tips for Managing Increased Bowel Movements

You don’t have to just grin and bear it. Try these practical steps:

• Adjust Fiber Intake
– Aim for 25–30 grams of fiber daily from whole grains, fruits and veggies.
– Spread fiber throughout the day to avoid sudden surges in bowel activity.

• Stay Hydrated, But Wisely
– Sip water, herbal teas or broth regularly.
– Watch caffeine, which can ramp up bathroom trips.

• Gentle Exercise
– Walking, prenatal yoga and pelvic tilts promote healthy digestion.
– Aim for at least 20–30 minutes of moderate activity most days.

• Track Your Symptoms
– Keep a simple stool chart: frequency, consistency, color.
– Note any new foods or supplements you introduce.

• Consider Probiotics
– Look for strains like Lactobacillus and Bifidobacterium.
– Talk to your provider before adding any new supplement.

• Practice Pelvic Floor Relaxation
– Avoid straining; bear down gently to let stool pass naturally.
– Kegel exercises can strengthen support but don’t overdo them.

When to Seek More Information

If you ever wonder “why is my poop” suddenly different in texture, color or frequency, don’t hesitate to explore further. You can do a quick, confidential, and doctor-approved free, online symptom check, using the doctor approved Ubie Symptom Checker to get personalized guidance on whether what you’re experiencing is typical or something that needs a closer look.

Possible Complications (Rare)

Some issues are uncommon but worth knowing:

• Inflammatory Bowel Disease flare-ups
• Viral or bacterial gastroenteritis
• Gallbladder or liver issues (e.g., cholestasis of pregnancy)
• Pancreatic or biliary problems

Any severe or persistent change should prompt a call to your healthcare team.

Key Takeaways

• Increased pooping in the third trimester is usually normal and due to hormones, uterine pressure, fiber and fluid changes.
• Monitor for red flags like blood, severe pain, fever or dehydration.
• Manage symptoms with dietary tweaks, hydration, gentle exercise and tracking.
• Use a free, online symptom check, using the doctor approved Ubie Symptom Checker if you need quick reassurance or guidance.
• Always speak to your doctor about anything that could be life-threatening or serious.

Every pregnancy is unique. If you’re ever in doubt, reach out to your healthcare provider. They’re your best resource for personalized advice and peace of mind.