Enter the mating date to work out when your sow is due. Guinea pigs are pregnant for about 66 days.
Guinea pigs are pregnant for about 66 days, and most give birth between day 59 and day 72 after mating. Enter the mating date for a due date and a timeline.
A sow having her first litter after about six months old is at risk of serious birth problems, so speak to your vet.
| Typical length | 66 days from mating |
|---|---|
| Usual range | Day 59 to day 72 |
| Day 21 | Your vet can confirm pregnancy by feeling her belly or by ultrasound. |
| Day 45 | Make sure she has plenty of hay, fresh greens and vitamin C, as pregnant sows need more. |
How to use it
Choose the animal and enter the date she was mated. The calculator adds the typical length of pregnancy for that species to give a due date, and shows the window in which most births happen. It also lists the checks and preparations worth planning, with their dates.
Pregnancy length varies between individuals, breeds and litter sizes, and counting from mating rather than ovulation adds a few days either way. Treat the due date as a guide and keep watching her closely as the window approaches.
Call your vet if she goes past the end of the normal window, strains for a long time without producing young, seems weak or distressed, has a green or bloody discharge before any young arrive, or if a long gap passes between births.
About 66 days, around 9 weeks, from mating. Most guinea pigs give birth between day 59 and day 72.
From about day 21 after mating. Your vet can confirm pregnancy by feeling her belly or by ultrasound.
If she goes past day 72 without giving birth, or shows signs of distress, straining without result or an unusual discharge at any point, contact your vet.
Use the first mating for dogs and cats, as eggs can be fertilised over several days. Use the last covering for mares. For livestock, use the service date, or the raddle mark for sheep.
It is a guide. Most births fall within the window shown, and ultrasound scans can narrow it down. Large litters often arrive a little early and single young a little late.
These tools are planning aids, not a diagnosis or a replacement for veterinary advice. If a pet is unwell, has eaten something risky, or you are unsure what to do next, contact a vet.