The best milk to feed orphaned baby rabbits is kitten milk replacer (KMR), available at most pet stores in powder or liquid form. Rabbit milk is unusually rich compared to other mammals, containing roughly 12–14% fat and 8–12% protein with very little sugar, so kitten formula is the closest widely available match. Cow’s milk and most other store-bought milks are far too low in fat and protein, and the lactose content can cause fatal diarrhea.
Why Rabbit Milk Is Hard to Replicate
Rabbit milk is one of the richest milks in the animal kingdom. Mature doe milk runs about 12–14% fat, 8–12% protein, and under 3% lactose. For comparison, cow’s milk is roughly 3.5% fat and nearly 5% lactose. That mismatch is why cow’s milk, goat’s milk on its own, and human infant formula are all poor choices for rabbit kits. The high sugar and low fat cause digestive problems that young rabbits rarely survive.
Colostrum, the first milk a doe produces, is even more concentrated: around 15% fat and 13.5% protein. Kits that miss colostrum lack critical antibodies, which makes hand-rearing significantly harder. If you’re raising kits from birth, getting them to a rabbit-savvy vet in the first 24 hours gives them the best chance.
Which Formula to Use
Powdered kitten milk replacer is the standard recommendation. Mix it at a 2:1 ratio of powder to water (twice the concentration listed on the label for kittens) to bring the fat and protein closer to rabbit milk levels. If you can only find liquid KMR, use it full strength without additional water.
Some experienced rescuers add a small amount of heavy cream to boost the fat content further, but this isn’t universally recommended and can cause digestive upset if overdone. A safer addition is a rabbit-specific or small-animal probiotic. Young rabbits depend on beneficial gut bacteria to digest food properly, and hand-raised kits miss the microbial exposure they’d normally get from their mother. Probiotic supplements containing lactobacillus strains in particular have been shown to increase beneficial bacteria in the rabbit gut while reducing harmful coliform populations.
If you have access to cecotropes (the soft droppings a healthy adult rabbit produces and re-eats), mixing a tiny amount into the formula can help colonize the kit’s gut with the right microbes. This sounds unpleasant, but it mimics a natural process that mother-raised kits go through.
How Much and How Often
Mother rabbits nurse only twice per day, typically at dawn and dusk. This surprises most people, but it’s normal. In the wild, does stay away from the nest to avoid attracting predators. You should follow the same twice-daily schedule rather than feeding every few hours like you would a kitten or puppy. Overfeeding is one of the most common causes of death in hand-raised kits.
The amount per feeding increases as the kit grows:
- Newborn to 1 week: 2 to 2.5 ml per feeding
- 1 to 2 weeks: 5 to 7 ml per feeding
- 2 to 3 weeks: 7 to 13 ml per feeding
- 3 to 6 weeks: 13 to 15 ml per feeding
These volumes assume two feedings per day. A kit’s stomach is tiny, and pushing more formula than it can handle leads to bloating or aspiration. If the kit stops swallowing or turns its head away, stop immediately even if you haven’t reached the target volume.
Feeding Technique
Use a 1 ml or 3 ml syringe (without a needle) for newborns, graduating to a larger syringe as the kit grows. Hold the rabbit in a natural upright position on all four feet, on a table or your lap. Keep its head straight and level, or angled very slightly upward. Never flip a baby rabbit onto its back to feed it. This position makes it dangerously easy for milk to enter the lungs instead of the stomach.
Dispense the formula slowly, one small drop at a time, letting the kit lick and swallow at its own pace. Warm the formula to body temperature (around 100–103°F) before feeding. Cold formula can chill a small kit quickly, and hot formula will burn its mouth. After each feeding, gently stroke the kit’s genital area with a warm, damp cotton ball to stimulate urination and defecation. Kits under about 10 days old cannot eliminate on their own.
Warning Signs During Feeding
Aspiration, when milk enters the lungs, is the biggest immediate risk. If you see formula bubbling from the kit’s nose, or if it starts gasping, coughing, or clicking while breathing, stop feeding immediately. Hold the kit with its head tilted slightly downward to let any fluid drain from the nose. Aspiration pneumonia can develop within hours and is often fatal in animals this small.
Bloat is the other major danger. A kit with bloat will have a visibly swollen, tight abdomen and will suddenly refuse to eat. It may stretch out repeatedly, hunch up, or stop producing droppings entirely. This is an emergency. Bloat can progress from first symptoms to death very quickly in rabbits, sometimes with no warning signs at all. If a kit’s belly feels hard and distended like a drum rather than soft and slightly rounded, it needs veterinary help immediately.
Transitioning to Solid Food
Kits begin nibbling on solid food around 2 to 3 weeks of age, even while still nursing. Place a small handful of grass hay in the nest box as early as two weeks. Timothy hay, oat hay, and orchard grass are all good choices. Hay is the single most important part of the rabbit diet at every life stage, and it should be available in unlimited quantities from the moment kits start showing interest.
You can also introduce plain alfalfa-based pellets around 3 weeks. Alfalfa provides the extra calcium and protein growing kits need. Continue formula feedings twice daily alongside solids until about 6 to 8 weeks of age, then gradually reduce formula as the kit eats more hay and pellets on its own. Fresh greens should wait until about 8 weeks old, and even then, introduce them one type at a time in very small amounts to avoid digestive upset.
By 8 weeks, most kits are fully weaned and eating hay, pellets, and small quantities of greens. The transition from formula to solids is a vulnerable period for gut health, so keeping the diet simple and hay-heavy during this window helps prevent the gastrointestinal problems that kill many young rabbits.