Guinea Pig Pregnancy Calculator
Pregnancy Timeline
Pregnancy Stages
Early Pregnancy (Days 1-20)
Weight gain begins. Increase food quantity by 10-20%. Provide extra vitamin C. Limit handling.
Mid Pregnancy (Days 21-40)
Visible weight gain. Increase food by 30%. Add alfalfa hay for calcium. Provide nesting materials.
Late Pregnancy (Days 41-59)
Significant belly growth. Increase food by 50%. Separate from males. Prepare birthing area.
Birth & Postpartum
Babies are born fully developed. Provide unlimited food for mother. Wean pups at 3-4 weeks.
Important Advice
- Double the vitamin C during pregnancy (50-100mg daily)
- Provide extra protein (good quality pellets and some alfalfa)
- Avoid handling the mother excessively in late pregnancy
- Prepare a quiet nesting area with soft hay
- Have an emergency vet contact ready
Related more Tools: Sheep Gestation Calculator – Accurate Lambing Date Tool,
How to Use the Guinea Pig Pregnancy Calculator:
- Select Your Language
- Use the dropdown menu at the top to choose your preferred language (supports 10 languages including English, Spanish, Arabic, etc.)
- Enter the Mating Date
- Click the date field and select the day your guinea pigs mated
- The calculator automatically defaults to today’s date if unsure
- Calculate
- Click the “Calculate Pregnancy Timeline” button
- Results will appear instantly below the button
Understanding Your Results:
- Due Date
- Guinea pigs have a 59-72 day gestation (average 68 days)
- The calculator shows the projected birth date in red
- Current Stage
Identifies which pregnancy phase your guinea pig is in:- Early (Days 1-20): Minimal visible changes
- Mid (Days 21-40): Visible weight gain
- Late (Days 41-68): Significant belly growth
- Postpartum: After delivery
- Days Remaining
- Countdown to due date (or days past if overdue)
- Stage-Specific Care Advice
The calculator provides tailored recommendations for each phase including:- Food quantity increases (from +10% to +50%)
- When to separate males
- Nesting material timing
- Vitamin C requirements
Essential Care Tips (All Stages):
✔ Double Vitamin C
50-100mg daily (critical for pregnancy)
✔ High-Protein Diet
Add alfalfa hay and quality pellets
✔ Minimize Stress
Reduce handling in late stages
✔ Prepare a Nesting Box
With clean, soft hay 1 week before due date
✔ Emergency Prep
Have vet contact ready for birthing complications
After Birth Care:
- Leave Pups Undisturbed for 24 hours
- Wean at 3-4 weeks (separate males at 21 days)
- Mother Needs Unlimited Food while nursing
Note: This tool provides estimates only. Always consult an exotic vet to confirm pregnancy and for personalized advice. Monitor your guinea pig daily for signs of distress.

Frequently Asked Questions (FAQs)
1. How accurate is this calculator?
✅ Very accurate for typical pregnancies – Guinea pigs have a 59–72 day gestation period, with an average of 68 days. The calculator uses this range to predict the due date. However, factors like the mother’s health, litter size, and breed can slightly affect timing.
2. What if I don’t know the exact mating date?
- If unsure, estimate based on when you first noticed breeding behavior (mounting, rumbling).
- Monitor for physical changes (weight gain, enlarged abdomen) and recalculate as symptoms appear.
- Visit a vet for an ultrasound or X-ray (possible after Day 40).
3. How can I confirm my guinea pig is pregnant?
Early Signs (Weeks 1-3):
✔️ Slight weight gain
✔️ Increased appetite
✔️ Thicker waistline
Late Signs (Weeks 4-9):
✔️ Visible belly movement (pups kicking)
✔️ Pear-shaped body
✔️ Nesting behavior (collecting hay)
Vet Confirmation:
- Palpation (after 2–3 weeks)
- Ultrasound/X-ray (after 4 weeks)
4. What should I feed a pregnant guinea pig?
Nutrient | Food Sources | Importance |
---|---|---|
Vitamin C | Bell peppers, kale, supplements (50–100mg/day) | Prevents scurvy, supports pup growth |
Calcium | Alfalfa hay, parsley | Bone development |
Protein | High-quality pellets, timothy hay | Milk production |
Fiber | Fresh grass, leafy greens | Digestive health |
Avoid: Iceberg lettuce, sugary fruits, or sudden diet changes.
5. When should I separate the male guinea pig?
🚨 Immediately after confirming pregnancy!
- Males can re-impregnate the female within hours of birth (dangerous for her health).
- Males may stress the mother or harm pups.
6. What are signs of labor in guinea pigs?
- 24–48 hours before birth:
- Restlessness, nesting, reduced appetite.
- During labor (typically lasts 10–30 mins per pup):
- Squatting position, visible contractions.
- Pups are born fully furred with eyes open.
Emergency: If labor lasts >1 hour with no pup, contact a vet immediately.
7. How many pups will my guinea pig have?
- Average litter: 2–4 pups (can range from 1–6).
- Larger litters may result in smaller pups or higher risks.
8. What if my guinea pig is overdue?
- Monitor closely beyond Day 72.
- Warning signs:
- No movement in belly.
- Loss of appetite/lethargy.
- Blood or discharge.
- Action: Seek an emergency vet—could indicate complications like pregnancy toxemia.
9. How do I care for newborn pups?
- Do NOT handle for the first 24 hours.
- Ensure pups are nursing (check for full bellies).
- Weigh daily – pups should gain 2–4 grams/day.
- Separate males at 3 weeks (to prevent early breeding).
10. Can guinea pigs have false pregnancies?
Yes! Symptoms mimic real pregnancy but resolve in 2–3 weeks. Causes:
- Hormonal changes after mating (even if unfertilized).
- Cysts or infections (consult a vet if recurring).
11. Why is my pregnant guinea pig losing weight?
Possible causes:
- Pregnancy toxemia (life-threatening—needs urgent vet care).
- Parasites or illness.
- Inadequate nutrition.
Solution: Increase high-calorie foods (oat hay, critical care formula) and see a vet.
12. Where can I find a guinea pig-savvy vet?
Search for:
- Exotic pet veterinarians (specializing in small mammals).
- Local guinea pig rescue groups for recommendations.
Need More Help?
For emergencies or unusual symptoms, always consult a vet. This tool is for educational use only.
💡 Pro Tip: Bookmark this page to track your guinea pig’s pregnancy week-by-week!