Baby rabbits should receive care from a licensed wildlife rehabilitator. Wildlife rehabilitators are trained to provide care for wild animals. They are licensed to do so by provincial and/or federal governments.
Baby rabbits need specialized formula, species-specific housing, and medical treatment that you cannot provide at home. It is illegal to keep any wild animal at home without a permit for longer than 48 hours. Please contact a wildlife rehabilitator right away for help with the baby rabbit you have found.