I started giving Nutter rodent block a week before his eyes open. He would chew on it and shread it but not eat much of it at around 7 or 8 weeks I stated giving him veggies and fruit and a little later and nut here and there and of course his formula. Though as he got older and closer to weaning age I got worried because he wasn't eating his rodent block very much. So I came across the recipe for Boo balls and he loved them and a week or two later he started eating his block (he also weaned himself). Now he is a little over 12 weeks and in his release cage. When I take out his food the first thing he goes for it the Boo ball then he well eat the rodent block. Now the amazing thing is he will eat it before the veggies or FRUIT!!!! I give him 6 rodent blocks (Kaytee) a day though once I gave him 12 and he ate all of them. SO anyway I definently recommend Boo balls!!!