Guinea Pig Pregnancy Calculator

Guinea pig pregnancy is a fascinating but delicate process. Unlike many other rodents, guinea pigs have a surprisingly long gestation period and give birth to pups that are fully furred, have their eyes open, and are able to run around shortly after birth. Our calculator helps you estimate the birth date, but understanding the process is key to ensuring the health of the mother (sow) and her pups.

Understanding Guinea Pig Gestation

The calculator estimates the birth window based on the date of mating.

• Gestation Period: The pregnancy of a guinea pig is notably long, lasting anywhere from 59 to 72 days.
• Average Duration: The most common average used for estimation is about 68 days.
• Litter Size Influence: Larger litters tend to have slightly shorter gestation periods, while smaller litters may have longer ones.

Our calculator provides an average due date and a wider birth window to account for this natural variability.

Signs of Pregnancy in Guinea Pigs

• Weight Gain: This is the most obvious sign. A pregnant sow can almost double her weight.
• Increased Appetite and Water Intake: She will need more resources to support the growing pups.
• Pear Shape: As the pregnancy progresses, her body will take on a distinct pear or lightbulb shape when viewed from above.
• Reduced Movement: In the final weeks, she may become less active and prefer to rest more.

Care for a Pregnant Sow

• Nutrition: Provide unlimited access to high-quality Timothy hay. Increase her intake of Vitamin C-rich vegetables. It is also recommended to supplement her regular pellets with some high-quality alfalfa hay and alfalfa-based pellets, as they provide extra protein and calcium needed for the pups' development.
• Housing: If she lives with other guinea pigs, you may need to separate the male (boar) to prevent immediate post-partum pregnancy. It's often best to keep her with a calm female companion for social support.
• Handling: Handle her gently and avoid picking her up around her abdomen, especially in the later stages of pregnancy.

Frequently Asked Questions (FAQ)

How can I be sure my guinea pig is pregnant?

Besides significant weight gain, a veterinarian can confirm pregnancy with an ultrasound. Feeling for pup movement is possible late in the pregnancy, but it should only be done by an experienced keeper or vet to avoid harming the sow or pups.

Do I need to separate the male guinea pig?

Yes. A female guinea pig can get pregnant again within hours of giving birth (this is called postpartum estrus). To prevent back-to-back pregnancies, which are very hard on the sow's body, the boar must be removed before she gives birth.

What is birth like for a guinea pig?

Kidding is usually very quick, often lasting only 10-30 minutes for the entire litter. The pups are born fully developed (precocial). The mother will clean them, and they will be able to walk and even nibble on solid food within hours.