Wombaroo Guinea Pig Milk Replacer 190g. Wombaroo Guinea Pig Milk Replacer is a nutritionally balanced milk substitute for guinea pigs. Use for orphaned pups, large litters or when mother’s milk is limited. Key Features: Specifically formulated to match the composition of guinea pig milk. High in Protein Content – to sustain the rapid growth of pups. Contains stabilised Vitamin C – an essential nutrient for guinea pigs.