Post actualizado el día octubre 25, 2026 by DeiviSanzPlay
If you’ve come across a newborn kitten, forget about giving it cow’s milk. It’s the first thing many people do, and it’s a mistake that can cost the kitten its life. Cow’s milk has too much lactose and too little fat for a feline that is only days old. Its digestive system isn’t prepared, and it will most likely end up with diarrhea, dehydration and, if not corrected, death within 48 hours. I’m saying it plainly because I’ve seen it.
Kitten milk replacer: the only real option if there’s no mother
When the mother isn’t there or rejects the kitten, feeding a newborn cat inevitably requires a milk replacer specifically formulated for kittens. Human baby formula or puppy formula won’t do. Look for formulas such as Royal Canin Babycat Milk, Beaphar Lactol or KMR. They are prepared with warm water, never hot, and administered with a special bottle with a small nipple or a syringe without a needle if the kitten doesn’t latch well.
The amount isn’t fixed. A one-week-old kitten usually takes between 2 and 4 ml per feeding, every 2 or 3 hours. At two weeks, about 5-7 ml every 3 hours. At three weeks, 8-10 ml every 4 hours. But this is just a guideline: what matters is its weight. Weigh it every morning with a kitchen scale. If it isn’t gaining between 5 and 10 grams a day, something is wrong. That’s when you need to review your technique or consult the vet.
The kitten’s temperature matters more than the food
A newborn kitten can’t regulate its temperature. If it’s cold, its body can’t digest. You give it milk and it sits in the stomach, fermenting, and it ends up vomiting or with gas. Before feeding it, make sure its body feels warm to the touch. The homemade way: keep a hot water bottle wrapped in a towel in its nesting box and check that the area is around 30-32 ºC. If it’s cold, warm it up first and then feed it.
Posture is also key. Never on its back like a human baby. Place it face down on a flat surface, with its head slightly elevated. That way you prevent the milk from going into its lungs and causing aspiration pneumonia, which is lethal. Let it suckle at its own pace. If milk comes out of its nose, stop, clean it and wait a few minutes.
How often should you feed a newborn cat?
The first two weeks are the hardest. You need to feed it every 2-3 hours, even at night. Yes, you read that right. A newborn kitten can’t go more than 4 hours without eating. If you can’t keep up that pace, get help or contact a shelter that has nursing mothers. It’s not a whim: its glucose level plummets and it can go into hypoglycemia within a few hours.
From the third week on, you can space feedings out to every 4 hours. At the fourth, every 5-6 hours. And from the fifth week, you start introducing wet food for kittens. But not before. Its stomach doesn’t yet produce enough enzymes to digest solid proteins.
Weaning: when and how to switch to wet food
Weaning a kitten begins around 4 weeks. It’s not a switch, it’s a gradual process. You start by offering a mush of wet kitten food mixed with milk replacer. The initial ratio: 1 part wet food to 3 parts milk. Warm it slightly so it releases aroma, because kittens rely on their sense of smell.
At 5 weeks, the mix can be 50/50. At 6, they can eat wet food on its own. And between 7 and 8 weeks, dry kitten kibble is introduced, always soaked at first. A trick: put a little wet food on a shallow saucer and let the kitten stick its paw in and then lick it. Kittens learn by imitation, but if there’s no mother, you are the model. Sometimes it works to rub a little food on its mouth with your finger.
Mistakes I see every week in consultation
- Giving whole or semi-skimmed cow’s milk. I’ve already said it, but I insist. It’s the number one cause of neonatal diarrhea.
- Feeding a cold kitten. It can’t digest and can die of hypothermia.
- Using baby bottles. The nipple is too big and the flow is uncontrollable. They choke.
- Forcing the food. If it doesn’t want it, don’t insist. Wait 30 minutes and try again. Force causes aspiration.
- Not stimulating defecation. Kittens under 3 weeks don’t urinate or defecate on their own. You have to massage their genital area with a warm damp cotton ball after each feeding. If you don’t, they become toxemic.
Supplements and when they’re necessary
If you use a good milk replacer, you don’t need supplements. Another matter is if the kitten comes to you malnourished or underweight. In that case, the vet may recommend an extra supply of vitamins or calcium, but never on your own initiative. An excess of calcium in a growing kitten can deform its bones and cause lifelong kidney problems.
Iron and vitamin B are also administered only under prescription. And be careful with probiotics: some are useful if there’s diarrhea, but they’re not a multivitamin. Nature is wise, and a complete formula already brings what’s needed.
Signs that something isn’t right
A healthy kitten eats eagerly, gains weight and sleeps peacefully between feedings. If you see that it cries constantly, refuses food, has a swollen belly or hasn’t pooped in 24 hours, call the vet. Don’t wait until tomorrow. Newborn kittens go downhill within hours.
Feeding a newborn cat isn’t just putting milk in its mouth. It’s monitoring weight, temperature, posture, frequency and stimulation. If you do all that, you have a good chance of pulling it through. If not, nature doesn’t forgive. So get your act together from day one.
