Baby Guinea Pig Care Essentials UK

Baby guinea pigs, called pups, have one of the easiest starts in the small pet world. Unlike hamster pinkies, pups are born fully furred with eyes open and can walk, eat and drink within hours. That head start makes them delightful to watch, yet the first three weeks still need careful setup. In the UK, most litters arrive as a surprise when a pet shop mis sexes a pair, so many owners meet pups with no preparation. This guide covers what to do from birth to weaning, based on owner feedback, breeder guidance and product reviews we compared.

What to expect at birth

Litters range from one to six pups, with two to four most common. Birth is usually quick and happens without fuss, often overnight. You will hear soft wheeks and find dry, mobile pups already huddled with mum. Weigh each pup on kitchen scales and note it - healthy pups weigh 60 to 120 g at birth. Daily weights should rise, not fall, over the first week.

Keep the cage in a quiet, warm room between 17 and 24C, away from direct sunlight and draughts. Avoid moving mum and pups for the first 24 hours unless the nest is soiled. If you must change bedding, lift the whole nest gently rather than separating pups from mum.

Housing for mum and pups

Use a single level cage with narrow bar spacing so pups cannot squeeze through. Remove platforms, lofts or ramps that tiny legs could slip through. Line the base with a thick, dust free paper bedding. Carefresh Natural Paper Bedding and Kaytee Clean and Cozy Extreme 40L both stay soft and absorbent, and breeder feedback reports fewer sneezes than with wood shavings. Back-2-Nature Bedding 30L is another low dust paper option that suits UK homes. Provide a large hide where mum can nurse in peace, plus hay rack and water bottle at low height. An ERKOON Chew Toy selection is not needed yet for pups, but keep one nearby for mum to gnaw.

Feeding in the first three weeks

Mum does most of the work, nursing pups for around 21 days. Give her unlimited timothy hay, fresh water, and a steady supply of complete guinea pig pellets plus daily vitamin C rich veg such as pepper and a little broccoli. Pups start nibbling hay and pellets by day two and will copy mum. You do not need to offer milk replacer - pups that eat and gain weight are getting enough milk. Scatter pellets rather than piling them, and keep fresh hay always available. Remove uneaten veg after a few hours so it does not spoil in the warm nest.

Handling and socialisation

For the first 48 hours, limit handling to brief health checks. Wash hands, scoop a pup gently with both hands, check eyes, nose and umbilicus, weigh, then return promptly to mum. After day three, add one short, calm handling session per day of a minute or two per pup while sitting on the floor. From week two, when pups popcorn and zoom confidently, you can extend to a few minutes. Children should sit on the floor and hold pups over a towel or fleece so a wriggle does not mean a fall.

Health checks and warning signs

Healthy pups are bright eyed, warm and active, with dry bottoms and steady weight gain. Watch for signs that need a vet: cold pups huddled and still, diarrhoea, laboured breathing, weight loss over two days, or mum not eating or passing droppings. Keep the cage clean with daily spot checks and a partial bedding change every three to four days. Full cage cleans can wait until pups are over a week old so the nest scent remains stable.

Sexing, weaning and separation

Guinea pigs must be sexed early because males become fertile at around four weeks. At 14 to 21 days, gently press above the vent: males show a clear i shaped slit with a penis that can be extruded with gentle pressure, females show a Y shape. If you are unsure, ask a vet or experienced rescue to confirm - mis sexing is how surprise litters happen in the first place. Wean at 21 days. By then pups eat solids well and no longer need milk. Remove males to a separate cage from mum and sisters at three weeks at the latest. Females can stay with mum. Keep same sex siblings together if space allows, as companionship supports settled behaviour.

What pups need after weaning

From three weeks, pups live as small guinea pigs. Provide the same unlimited hay, pellets limited to about one tablespoon per pig per day, and a small daily portion of veg. Keep handling daily so pups stay tame. Offer a hide and chew items such as apple wood sticks for dental wear. If you cannot keep all pups, contact a reputable UK rescue before advertising privately - they will health check, sex correctly and find homes that keep same sex pairs together.

Frequently Asked Questions

Final Verdict

Baby guinea pigs are hardy from birth, but those three weeks with mum set their future health and temperament. Keep the nest warm, dry and quiet with quality paper bedding, let mum handle the feeding, handle briefly after day two, and separate by sex at 21 days without exception. Do that and pups grow into confident, well socialised companions that slot straight into a normal guinea pig routine.

Related reading: Guinea Pig Care Guide, Best Guinea Pig Cages, and Guinea Pig vs Rabbit.

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Last reviewed: 22 August 2026 · Evidence-based content · Contains affiliate links