We are receiving 3 rabbits soon 2 mini Rex and a Holland lop what would be the best food for them all babies ranging in age
Could you explain about the rabbits you are getting? What are their ages (in weeks) and what are their genders? Since this is your first post, we don't know what (if any) experience you have with rabbits. Are you aware that getting two young rabbits runs the risk of them not getting along once hormones activate? Having 3 continue to get along is very unlikely.
Rabbits usually get along fine as babies. But once hormones activate, they can begin fighting. In order for rabbits to bond, they must first be fixed (both males and females, and even if they are all males or all females). Once fixed, they need to go through a bonding process. Some bonds work, some don't. (Have you checked the costs of spays and neuters in your area?)
So if you get baby rabbits (not recommended for first time owners) then it is likely that they will need to be separated -- each in its own cage and own exercise area -- once hormones kick in. Then, after they have healed, they may have to continue to be kept separate if they decide to not bond. Just wanted to be sure you are aware of this possible outcome.
It is recommended, for this reason, that new bunny owners start with an already fixed rabbit, or an already bonded and already fixed pair of rabbits. Trios can be quite tricky and really not recommended for beginners.
About food, rabbits under 6 months should have plain (no colorful add-ins) pellets that are alfalfa-based. That switches to timothy-based as they grow. But the main part of a rabbit's diet is hay.