Wombaroo Cat Milk 5kg. Wombaroo Cat Milk Replacer is a nutritionally balanced milk substitute for kittens of all breeds. Use for orphaned kittens or when mother’s milk is limited. Key Features: Specifically formulated to match the composition of the mother’s milk. High in Whey Proteins – for improved growth rate of kittens. Elevated Taurine Content – an essential nutrient for the development of healthy kittens.