Guinea Pig Gestation Calculator

Track your sow's pregnancy milestones and estimate the arrival of fully-developed pups.

Pregnancy Timeline

Breeding Date

Pregnancy Progress Map

Day 50

Enlargement

Day 60

Final Prep

Day 65

Due Date

Day 72

Latest Due

Expected Delivery

Sep 20, 2026

Estimated Due Date

Estimated arrival based on a 65-day average.

Window OpensSep 14, 2026

Window ClosesSep 27, 2026

Remember to increase Vitamin C and Calcium (Alfalfa) during this period!

Watch for the pubic bone separation in the final 48 hours.

The Incredible Guinea Pig Gestation

Guinea pigs have one of the longest gestation periods for their size (59–72 days). This is because pups are born 'precocial'—fully furred, eyes open, and ready to nibble solids within hours. They are essentially miniature versions of adults at birth!

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Pro Tips

Vitamin C Boost: Pregnant sows need 2-3 times their normal Vitamin C (roughly 30mg daily). Use fresh peppers or specialized supplements.
The Pelvic Check: About 48 hours before birth, the pubic symphysis (bones near the tail) will open significantly (about 1-2 fingers width).
Low Stress: In the final 2 weeks, limit handling and keep the cage in a quiet area to prevent pregnancy toxemia.
Alfalfa Hay: Introduce alfalfa hay for extra calcium during late pregnancy and while nursing.

Fun Facts

"A pregnant guinea pig can double her body weight during the 9-week gestation!"
"Pups start trying to eat hay and pellets just hours after being born."
"Sows do not build nests; they simply find a quiet corner when it's time."
"Guinea pigs have 'post-partum estrus,' meaning they can get pregnant again just 2-15 hours after giving birth!"

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