Faith also took on another stray little rabbit as her own, and this little boy was about the same age and size of the rabbits from her litter. (leapsandboundsrabbitrescue.cfsites.org)
Another consideration is the size of a rabbit. (indianahrs.org)
A cage should be at least 4 times the size of your rabbit - more if he is confined for a large amount of the day. (indianahrs.org)