ready 4 veggies?

I gave my rabbit a tiny piece of lettuce for 3 days now. Can i give him vegetables everyday ? he is 3 months old. i will introduce new vegetables every week but how much should i increase the amount ? Also when can i give him fruits (treats) ?

I got my Bunny Teddy about 2 and a half weeks ago. The one of the workers told me that he was 12 weeks (now hes 14 weeks) and he could not have any veggies until hes 1 year old or else he will get some sort of disease. Im really confused because online it said 6 months. Is the worker right or...