Young bunnies should get unlimited alfalfa pellets and hay at that age (3 months), as they need the protein to grow; but as they get older, you should start transitioning them to timothy and other, lower-protein, high-fiber, hays as well as timothy-based pellets. After 6 months or so they shouldn’t get large quantities of alfalfa, either in hay or pellets. Adult rabbits should only get a small quantity of timothy-based pellets per day, generally 1/8 to 1/4 cup per 5 pounds adult body weight. The vast majority of their diet must always be grass hay (timothy and other types such as orchard and oat), at least 75% of what they eat daily. I find that my own two buns get their daily requirement of hay if I provide them with big handfuls at least equivalent to their body volume/size in their litterbox at least twice per 24-hour period, along with more hay in the hay feeder attached to their condo. They do most of their hay-eating in their active hours around dawn and dusk but will nibble occasionally throughout the day.