A newborn guinea pig is a miniature of its parents in a way a newborn rabbit or hamster is not. Pups are born furred, eyes open, teeth ready, and able to scurry within hours, because guinea pigs have a long gestation that does much of the growing before birth. That head start changes your job: less hand-rearing, more careful watching, warmth, and protection while the pups learn the enclosure.
Set the enclosure up for small, wobbly legs
Keep mother and pups on one level for the first days, removing ramps, lofts, and high hammocks a newborn could fall from or get stranded on. Lower the water bottle spout or add a shallow, heavy bowl a pup can reach without stretching, and check it cannot climb in and become chilled. Bars and grids that suit adults can trap a pup's head or let a tiny body squeeze through, so check spacing around the whole enclosure, including the door.
Hold the room warm and free of drafts, with deep bedding the pups can burrow into beside their mother. A hide with a low entrance gives the family a retreat, and keeping the enclosure in a quiet corner matters, because a new mother startled repeatedly may scatter pups she would otherwise settle with.
Confirm every pup is nursing and gaining
Pups nurse often and briefly, tucking under the mother, and they should feel warm and round-bellied when you lift them gently for a check. Weigh each pup on a kitchen scale on the first day and record it, marking pups with a dab of pet-safe colour on an ear if needed to tell similar coats apart, then weigh daily for the first stretch. Steady gain is reassurance; a pup that loses weight, feels cool, or is repeatedly found alone away from the group needs prompt veterinary advice, because newborns have little reserve.
Watch that existing adult cagemates, especially a boar, are not chasing the mother or crowding pups away from food, and separate any adult whose presence stresses the new family into a neighbouring enclosure within sight and smell.
First foods alongside milk
From the second day or so, pups begin nibbling hay, pellets, and the fresh foods their mother eats, learning the menu by copying her. Keep hay unlimited and low, offer the mother's usual vitamin C rich vegetables where pups can reach them, and resist introducing brand-new foods in these days, because the mother's familiar diet is the safest classroom. Nursing continues for several weeks even as solid food intake grows, so a pup seen eating hay still needs its mother and should not be separated.
Feed the mother generously through this period, with constant hay, her regular pellets, and extra fresh food, because she is fuelling herself and the litter at once and her condition is the pups' supply line.
Handling and health checks in miniature
Brief, gentle handling from early on helps pups grow into calm adults, but keep first sessions short, seated low, with the pup supported fully in cupped hands over a soft surface, and return it to its mother before it becomes chilled or distressed. Look over each pup daily for clear eyes, a clean nose, dry bottom, and even movement on all four legs. Laboured breathing, a pup that will not feed, discharge from eyes or nose, or a mother that stops eating herself all merit a call to a veterinarian the same day.
Recording each pup's birth weight, markings, and first observations from day one builds the record its future care stands on, and KinsLe Pet Passport keeps those newborn details with the family's health notes in one place for the first checkup.