Yes, as everyone has said, that is a healthy rabbit. Like other grazers, rabbits need to constantly have something working through their digestive tract. Do not limit any feed until they are 16 weeks old, then limit pellets but NEVER limit hay. At 12 weeks you can begin introducing fresh greens. Start with 1 TBS a day, if that is okay after 3 to 5 days, add another TBS and, keep going like that until you get to feeding 2 cups of fresh greens a day.
If you see any soft poop while introducing greens, remove the last TBS you added, wait 3-5 days and try it again, if that green causes problems a second time, find a different green to give them. Not all rabbits can eat all greens but, most can have most greens. Parsley, Basil, clover and leaf lettuce are good first greens to start with. Kale, cabbage and other cruciferous greens should be the last ones you introduce but, should be introduced at some point.