Keep the baby bunny warm: Baby rabbits are very susceptible to cold, so it's important to keep them warm. Place the baby in a box or container lined with soft material, such as a towel or blanket. You can also use a heating pad set on low or a hot water bottle wrapped in a towel to provide additional warmth.
Provide food: If the baby rabbit is 2-3 days old, they will still be relying on their mother's milk for nutrition. You can try feeding the rabbit kitten milk replacer (KMR) or goat's milk mixed with water. Use a syringe or dropper to feed the rabbit small amounts of milk every few hours.
Stimulate elimination: Baby rabbits need to be stimulated to eliminate waste. To do this, gently rub the rabbit's belly and hindquarters with a cotton swab or soft cloth after each feeding.
Handle with care: Baby rabbits are very fragile, so it's important to handle them with care. Support the rabbit's head and body when you're picking them up, and avoid squeezing their stomach.
Seek professional help: Again, it's essential to seek professional help from a wildlife rehabilitator or veterinarian as soon as possible. Caring for a baby rabbit requires specialized knowledge and resources, and attempting to do it yourself without the proper training or equipment can be harmful to the rabbit. If you're unable to find a local rehabilitator, you can contact the nearest animal shelter or wildlife agency for assistance.