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Guinea Pig Pregnancy: Stages of Reproduction & Care (Vet-Approved)

Kathryn Copeland

By Kathryn Copeland

Pregnant Guinea pig inside the enclosure

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Reviewed & Fact-Checked By

Dr. Lauren Demos

DVM (Veterinarian)

The information is current and up-to-date in accordance with the latest veterinarian research.

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It can be difficult to tell when a guinea pig is pregnant, but if you at least suspect that your guinea pig is expecting, the first thing that you should do is consult your vet.

If they confirm the pregnancy, you’ll then want to become familiar with its stages so you can care for and support your pet during this time.

Here’s a week-by-week look at the stages of guinea pig pregnancy, in addition to any issues that might occur. You’ll be prepared for the onslaught of adorable little bundles of fluff in no time!

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How Long Are Guinea Pigs Pregnant?

Guinea pigs (also called cavies) are pregnant longer than many other small animals. The pregnancy can range from 59 to 72 days, averaging 65 days (roughly 9 weeks).

They can have between one and eight offspring, with the average being four offspring in a litter.

The 5 Stages of Guinea Pig’s Pregnancy

1. Early Stages (Weeks 1–3)

During this time, it can be challenging to determine if your guinea pig is pregnant. Once you’ve established that she is, she should eat and drink as much as she wants.

You’ll need to replace her regular hay with alfalfa hay, which is richer in nutrients, including calcium and protein, which are necessary for her growing pups.

You might find your sow (female guinea pig) eating more and preferring fruits and veggies high in vitamin C during this time.

guinea pig sitting in a cage on a wood filler
Image Credit: Garna Zarina, Shutterstock

2. Middle Stages (Weeks 4–6)

At about 21 days, the pups will be visible on ultrasound, which is when your vet can check on their development.

Your cavy should be noticeably larger at this stage, but how large she gets depends on how many pups she carries. By weeks 5 and 6, her abdomen and hindquarters should be more prominent.

You should weigh her every week to monitor her weight to see that she’s gaining steadily. Weight gain that happens too quickly can lead to complications, as can losing weight.

3. Late Stages (Weeks 7–9)

By week 7, you should be able to feel and see the pups moving, and her abdomen will be quite distended. She might have difficulty getting around in these later stages of her pregnancy.

At this point, she must be kept in a stress-free environment, which includes removing any other guinea pigs from the enclosure.

Don’t remove the sow from her regular cage, though, as you’ll want things to remain familiar for her. The less stress for her, the easier the birth will be.

4.  The Week Before Birth

Unlike many other animals, guinea pigs don’t create a nest for their upcoming birth, so you’ll want to provide yours with a comfortable space.

Add a soft, small blanket to where she sleeps, and place a towel or blanket over the cage on the side, also where she sleeps. You’ll want to do spot cleaning every day without removing your cavy.

Try not to handle her at this time in order to avoid stressing her out.

pregnant guinea pig nesting inside the cage
Image Credit: AllaMosurova, Shutterstock

5.  Labor and Birth

Most guinea pigs give birth during the day, and most of the time, labor typically only lasts about 30 minutes. The sow will lick and ingest the amniotic sacs on her pups, along with the placenta.

If your guinea pig is in labor for more than 20 to 30 minutes without giving birth or shows signs of distress, you’ll need emergency veterinary help. It’s likely a cesarian section will be necessary.

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Signs of Pregnancy

Before any of this occurs, you’ll need to know if your guinea pig is pregnant or not. If your female cavy was housed with an intact male, she’s likely pregnant. As the pups develop, you’ll notice the following signs:

  • Foul scent due to the male urinating on the female after mating
  • An increase in appetite and thirst
  • A belly that has visibly grown
  • Weight gain
  • Lumps that you can see and feel in the abdomen

The best way to tell if your guinea pig is pregnant is to take her to your vet for an ultrasound, though the pups will be more noticeable when the sow has been pregnant for about 21 days.

hand feeding pregnant guinea pig with cucumber
Image Credit: VelP, Shutterstock


Unfortunately, there can be complications that crop up during pregnancy and birth. It’s critical that you’re familiar with these conditions so you can act swiftly if the unthinkable occurs.

Pregnancy Toxemia

Pregnancy toxemia is also known as ketosis, which is a serious condition that can occur in the last several weeks of pregnancy. It’s when the body produces too many ketones.

It commonly affects cavies that are pregnant with their first or second litter. Unfortunately, some guinea pigs die from ketosis without any signs of trouble, but others will show the following signs:

  • Loss of appetite
  • Loss of energy
  • No desire to drink
  • Muscle spasms and tremors
  • Clumsiness and disorientation
  • Coma
  • Death (occurs within 5 days of a coma)

The best way to prevent ketosis is to ensure that your guinea pig is eating high-quality and nutritious food over the course of the pregnancy.

Closely monitor her weight and appetite, particularly in the last 3 weeks of the pregnancy. Speak to your veterinarian if you notice any changes.

Labor Dystocia

If your guinea pig is in labor for more than 30 minutes without producing any pups, she might be experiencing labor dystocia, which means “difficult labor.”

It can happen if a pup gets stuck in the birth canal due to the cartilage of the pubic bones stiffening. This can occur when a guinea pig ages or is a first-time mother that is over 7 months of age. The pubic bones can’t stretch far apart enough to allow the pups to pass through.

Other signs of dystocia are:

  • Labor lasting more than 40 minutes
  • Labor hasn’t begun after the due date
  • Only part of a pup emerges but doesn’t progress
  • Excessive straining without any results
  • Significant bleeding while in labor
  • Extreme pain while in labor

This is an emergency situation, so the moment that you see your guinea pig struggling, take her to the vet immediately. She will need medical help to remove the pups, and a C-section might be necessary.

guinea pig giving birth
Image Credit: I Wayan Sumatika, Shutterstock

Guinea Pig Litters

Guinea pig pups are born precocial. This means that unlike many other species (cats, dogs, rabbits, etc.), the pups are born practically ready to go. Their eyes and ears are open, they have fur, and they can start eating solid food shortly after birth.

Birth weights should be around 1.7 to 3.5 ounces (large litters will have small babies and vice versa). If a pup is under 1.4 ounces, they will require supplementation.

They will nurse from their mother for the first 21 days. After that, you should determine the sexes and remove the males from the females to avoid more pregnancies.

The pups should be weighed every day to ensure that they are gaining weight. They should be seen by the vet if they seem sick or aren’t eating or gaining weight.

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Guinea pigs are pregnant for up to 9 weeks, though how long they are pregnant depends on the size of the litter. The fact that the pups come out nearly fully formed is due to the length of the pregnancy.

Of course, it’s usually easy to tell if your cavy is pregnant when she’s a few weeks away from giving birth–your little potato will look more like a little pear!

But as long as you feed her well and watch her carefully and have your vet on standby, before you know it, you’ll have a whole bunch of super cute mouths to feed!

Featured Image Credit: Rabiul Hasan Rajon, Shutterstock

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