At two months, he should be still getting alfalfa, at least in hay form. (unless he is overweight)
Here is a great link to diet requirements suggested by the House Rabbit Society
It is normal for a bunny to want to stick with alfalfa. When it is time for him to switch, do .
gradually. It should take about 3 weeks to a month to make the switch, Each week gradually increasing timothy, and decreasing alfalfa.
It's safer for them anyway as any drastic switches can cause serious digestive problems.
When I had a baby bunny, I remember he hated the new timothy based, and for the first week would eat the alfalfa, and leave the timothy, but the next week, he began to nibble on the timothy (feeling hungry has a way of doing that), and then by the third week, he was eating it all. Fourth week, he didn't even seem to notice that alfalfa was no longer in there.