Many owners start sterilizing their kittens at the age of six months or so. Your kitten's metabolism slows down 48 hours after the procedure, but they'll probably still be extremely hungry! Your sterile kitten needs food that promotes healthy growth without unnecessarily causing weight gain because their activity levels are still high. The purpose of ROYAL CANIN® Sterilized Kitten is to provide the nutritional requirements of sterile kittens during the "consolidation phase" of their growth. Since sterilised kittens go through a period of significant physical and behavioural changes, this formula is appropriate for kittens aged 6 to 12 months. This customized diet still has the ideal amounts of calcium and protein but with a moderate fat content to help lower the risk of weight gain.