no milk products for baby guinea pigs and at this point I wouldnt try to feed it anything anyhow as it is probably dehydrated so SQ lactated ringers would be best. But you can also try to get some sugar water if no pedialyte is available but be careful especially being so weak its easy to aspirate them when they are little. But it doesn't sound good, there may be something wrong with it guinea pig moms feed a number of babies just fine and should have no issues. Just make sure its comfortable and try your best but be prepared that this little one might not make it and not due to anything done wrong, it just happens.
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