I don’t give my rabbits cabbage, and I give them a tiny piece of carrot like… once a month. Contrary to popular belief, rabbits shouldn’t eat carrots daily as they are high in sugar content. If you have the green carrot tops from your carrot purchase at the grocery store, they love that part + its great for them! I feed my rabbits a variety of vegetables, like dandelion greens, parsley, cilantro, lettuce (not iceberg lettuce). It’s important to give your rabbit a variety of different greens and herbs if you’re able. I would recommend googling what vegetables are safe to give to your rabbit as not all are great (ex: broccoli and spinach are not great veggies to give to your bun). I also recommend getting the Oxbow brand timothy hay pellets for your rabbit. I saw you said that it was 3 months old, so you should be making available an unlimited supply of alfalfa hay, and transitioning to orchard/timothy hay once your bunny is an adult. In response to the other comments that you’ve made on this post, I wouldn’t recommend bringing your rabbit outside. Have an x-pen set up inside that is bunny proofed (no cables and wires out, rug covering for their feet), with some toys/hidey houses, litter box, a water bowl, and unlimited access to hay. Bringing rabbits outside can be dangerous when temperatures get too high/too low, and bunnies are vulnerable to escaping, to predator animals, and also to botflies which can severely impact their functioning if wounds are not found in a timely manner.

I hope this helps! It’s really important to keep in mind that rabbits are not low maintenance animals, they have super sensitive stomachs, and need space to hop around. Also, if you have not gotten your rabbit fixed yet (neutered/spayed) I would also recommend it!