Sorry for your loss. Most research rabbits never get anything but pellets as their diet, so they don't really know much about greens and when their tract can handle it. My first bunny I fed greens from our garden from 6 weeks onward and she was fine, but the breeder gave the mom and baby greens from early on. As for my bunny now, I slowly introduced greens at 3 months and she gets them every other day in small amounts, but mainly hay/pellets since she's under 6 months. She sometimes has runny cecotrophs so I didn't want to introduce too many veggies. Again, I am sorry for your loss and best of luck with Max, he's very cute!