Guinea Pig Pregnancy Calculator

A guinea pig is pregnant for approximately 68 days (about 9.5 weeks). The normal range is 59 to 72 days. First-time mothers (under 6 months) may have shorter pregnancies of 59-65 days, while experienced sows often go 68-72 days.

Signs include: belly enlargement after week 3-4, weight gain, increased appetite, nippling (nipples becoming prominent), and behavior changes. Gently feel the belly for fetal lumps after week 4. Ultrasound can confirm pregnancy as early as day 20.

Guinea pigs typically have 1-4 pups per litter. First-time mothers usually have 1-2 pups. Experienced sows may have 3-4. Litters larger than 4 are rare and may indicate multiple sires (superfetation is possible in guinea pigs).

Set up a separate birthing cage around day 50-55. Use a quiet, draft-free area with soft bedding. The mother should become familiar with the space before delivery. If housing other guinea pigs, the mother can return to the group after 2-3 weeks postpartum.

Yes. Guinea pigs can ovulate shortly after giving birth. While they usually do not cycle during active nursing, it is possible to conceive within 2-4 weeks postpartum. To prevent this, keep the mother separated from males until weaning.

Signs include: restlessness and pacing, nesting behavior, pulling fur, loss of appetite, and increased vocalization. Labor typically lasts 15-30 minutes. Pups are born fully furred with open eyes and can walk within hours.

Females should be bred before 6-7 months of age for the first time. After 8 months, the pelvic bones fuse and dystocia (difficult birth) risk increases dramatically. Males can breed throughout their lives, though fertility declines after 18-24 months.

Provide unlimited timothy hay, fresh vegetables (especially leafy greens for calcium), and high-quality guinea pig pellets. Vitamin C is essential — supplement with fresh bell peppers, parsley, or a vitamin C tablet. Avoid iceberg lettuce and excessive fruit.

Yes. Guinea pigs can conceive again while already pregnant (superfetation). This is rare but possible. If a male is kept with the pregnant female, she may conceive a second litter with a different due date. Always separate males from pregnant females.

No. This Guinea Pig Pregnancy Calculator is an informational tool for educational purposes only. It should never replace professional medical advice, diagnosis, or treatment. Always consult a licensed healthcare provider for medical decisions.

The formulas used in this Guinea Pig Pregnancy Calculator are based on peer-reviewed research and guidelines from recognized health organizations including the WHO, CDC, and NIH. Sources are listed in the references section.

Health calculators provide estimates based on population-level data. Individual results may vary due to factors like muscle mass, genetics, medical conditions, and lifestyle. Use results as general guidance, not definitive diagnoses.