Guinea Pig Pregnancy Calculator
Enter the breeding date to get due date and full pregnancy milestone timeline.
Pregnancy Timeline
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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Request a ToolHow to Use the Guinea Pig Pregnancy Calculator
Enter the date your guinea pig was with a male to calculate the expected due date and full pregnancy timeline. Here is how to read the results:
- Enter the breeding date. Use the first date the female was housed with a male. Guinea pigs can mate within hours of birth (postpartum estrus), so separate males immediately after any pregnancy is suspected.
- Read the delivery window. Guinea pig gestation ranges from 59 to 72 days, with an average of 65 days. This is a wider range than dogs or cats, so expect delivery anywhere in this window.
- Use the milestone timeline. Key milestones include when you may first feel babies by gentle palpation, when movement becomes visible, and when the pelvic bones separate in preparation for birth.
Use Share to send the timeline to a fellow guinea pig owner or your vet. Use Copy to record the due date.
About Guinea Pig Gestation
Guinea pig pregnancy has the longest gestation period of common small pets, at 59 to 72 days. The benefit of this long gestation is that guinea pig pups are born fully developed: they are born with fur, open eyes, and functional teeth, and can eat solid food within hours of birth. Litters are typically 2 to 4 pups, though single-pup and 6-pup litters occur. Larger litters tend to have shorter gestation periods.
Guinea pigs have a unique postpartum estrus, meaning females can become pregnant again within hours of giving birth. A male must be separated from the female before she gives birth. Guinea pig mothers are excellent caregivers, but the pups should be weaned at 3-4 weeks and sexed to prevent early pregnancy in female pups, who can become pregnant as early as 4 weeks of age.
Frequently Asked Questions
How long is a guinea pig pregnant?
Guinea pigs are pregnant for 59 to 72 days, with an average of 65 days. This is one of the longest gestations among small pets. The wide range is normal and not a cause for concern. Larger litters often arrive a few days earlier, while single-pup litters tend to have longer gestation periods. If your guinea pig has not delivered by day 73, contact your vet as dystocia (difficult birth) is a serious risk in guinea pigs.
How many pups does a guinea pig have?
The average litter size for guinea pigs is 3 to 4 pups, though litters of 1 to 6 are common. First-time mothers often have smaller litters. Guinea pig pups are precocial, meaning they are born fully developed with fur, open eyes, and the ability to eat solid food within hours. Despite their maturity at birth, they still benefit from nursing and should not be fully weaned before 3 weeks of age.
What special care does a pregnant guinea pig need?
Pregnant guinea pigs need increased vitamin C, calcium, and protein. Provide unlimited timothy hay, fresh leafy greens rich in vitamin C (bell peppers, kale, parsley), and a small amount of alfalfa hay in the last few weeks for extra calcium. Avoid handling roughly after day 40 as the fetuses are fragile. Provide a quiet, stress-free environment. Keep the male separated after day 50 to prevent postpartum pregnancy. Schedule a vet check if the guinea pig seems lethargic, loses appetite, or does not deliver by day 73.
What are signs a guinea pig is about to give birth?
Signs that delivery is approaching or beginning include: the guinea pig becoming restless and shifting positions frequently, a noticeable pelvic gap or widening of the hindquarters (the pubic symphysis separates in the final days), loss of interest in food, more frequent urination, and the guinea pig sitting in a hunched position. Active labor is usually brief in guinea pigs, with pups delivered every 3-5 minutes. If more than 20 minutes pass between pups with obvious straining, contact a vet immediately.