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Warm water enema
Until a kitten can walk, the most important thing, besides properly feeding them, is to ensure they are appropriately stimulated to defecate after feeding by gently rubbing their anal area with a warm, damp cloth to mimic a mother cat's grooming behavior.
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How to properly change foods to avoid diarrhea or constipation
Kittens under one year of age are still developing, including their little digestive tract. For this reason, avoid feeding your fur babies anything with fish.