The best milk for kittens is of course their own mother’s milk. But sometimes kittens get abandoned without a mother, or there just isn’t enough milk to go around. In these cases you need a kitten milk replacer (KMR) to give your kittens the nutrition they need to survive.

The best milk replacement for kittens is one that closely matches the nutritional composition of a queen’s milk and supports their digestive system. We have reviewed the most popular KMR products on the market today and picked the top five for your convenience.

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A Quick Look At Our Favorites

ProductRatingWhy We Like It
1PetAg KMRNewborn FormulaBuy on Amazon
2Well & Good Milk Replacer Powder for KittensContains ColostrumBuy on Amazon
3PetAg KMR 2nd StepWeaning SolutionBuy on Amazon
4Hartz Kitten Milk ReplacerBudget OptionBuy on Amazon
5PetAg PetLac Kitten Milk ReplacementLiquid MilkBuy on Amazon
MoistureProtein* (min.)Fat* (min.)Fiber* (max.)Carbs* (approx.)Ash* (approx.)Calories (approx.)Allergens
15%44.2%26.3%0%21.1%8.4%74 / 100gmilk, corn
25%44.2%26.3%0.2%20.8%8.4%450 / 100gcorn
38%37%12%4.3%38%8.7%360 / 100gmilk, rice
45%31.6%42.1%0.8%17.1%8.4%500 / 100gnone
585%30%33.3%1.3%26.7%8.7%74 / 100gmilk
What We LikeWhat We Don't Like
1
  • Contains probiotics
  • Closely matches queen's milk
  • No artificial flavors
  • Also comes in a liquid, canned version
  • Contains cow's milk and corn syrup
  • Difficult to mix
  • Improperly mixed formula can cause constipation
2
  • Perfect for orphaned or underfed kittens
  • Contains colostrum
  • Closely matches queen's milk
  • Does not contain cow's milk
  • Contains corn syrup
  • Doesn't contain Vitamin E
  • Doesn't contain probiotics
3
  • Great weaning formula
  • Works for sick and old cats
  • Perfect for underweight cats
  • Can cause severe diarrhea
  • Contains cow's milk and rice
  • High carb content
  • Contains artificial flavors
4
  • Affordable
  • Does not contain cow's milk
  • No allergens
  • Cats love it
  • Works for sick and old cats
  • Not for newborns
  • High fat content
  • Has a very sweet smell
  • Contains artificial flavors
5
  • Great alternative to powdered formula
  • Easy to use
  • Easy to digest
  • Contains cow's milk and carrageenan
  • Less protein/more carbs than powdered version
  • Short shelf life

When To Use A Kitten Milk Replacer

Kitten milk replacers are useful in a number of different situations:

  • You are fostering orphaned kittens;
  • Your cat had an exceptionally large litter and she isn’t producing enough milk;
  • Your cat is pregnant or nursing and needs help keeping her calories up;
  • Your cat is old or sick and needs an easily digestible source of nutrients;
  • Your cat refuses to drink water and runs the risk of becoming dehydrated;
  • As a treat for adult cats.

Is KMR Good For Kittens?

In all cases, it is best for kittens to feed off of their mother’s milk for at least the first two days of their lives. This ensures that they get all the antibodies and colostrum they need to support their immune system. After those two days, or sooner if the kittens are orphaned, it is perfectly safe to give them KMR.

If your kittens are orphaned or malnourished, you should feed them a milk replacer that contains colostrum. Colostrum is a source of nutrients and immunoglobulins that helps to mature the digestive tract. It greatly increases your kitten’s chances of survival.

After four to six weeks you can start weaning the kittens and transition them to solid (wet) food. Check out our Cat Food Database for cat foods specifically designed for kittens. If your kittens don’t seem too eager to make the switch yet, you can use a special weaning formula to make the transition a little easier for them.

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Does KMR Contain Cow’s Milk?

Some kitten milk replacers do in fact contain cow’s milk, usually in the form of dried skimmed milk. This might surprise you, since cats are known to be lactose intolerant. In most cases, however, the milk content is low enough for cats to tolerate it.

If you decide to give your kitten or cat a milk replacement, be sure to monitor their bowel movements. If you start seeing runny stools, your cat probably can’t tolerate the cow’s milk and you should switch to another formula. You can also try goat’s milk or probiotic yogurt as an alternative.

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To make it easier for you, we explicitly mention with our reviews whether or not a product contains milk.

Best Milk Replacer For Kittens

A good milk replacement for kittens contains enough calories from protein and fats to help them grow, supplemented with the right vitamins (A, D3, E, and B12), minerals (calcium, zinc, iron) and amino acids (taurine, folic acid). The best milk replacement for orphaned or malnourished kittens also contains colostrum and probiotics to support the immune and digestive system.

Overall Best Milk Replacement For Kittens: PetAg KMR

PetAg KMR is the go to milk replacement for many kitten fosters and animal shelters. It contains everything kittens need during their first four weeks of life and closely resembles the nutritional profile of a mother cat’s milk.

Unfortunately, it does contain cow’s milk. If your kittens get diarrhea or vomits after drinking this kitten milk replacer, they are probably lactose intolerant and you should switch to a different formula without cow’s milk.

PetAg KMR is a powdered formula, like most of the products on our list, though it does also come in a canned liquid version. It looks and works pretty much the same as human baby formula. You add the powder to warm water and mix it until it is fully dissolved. Then you can use a syringe or a feeding bottle for small pets to feed it to your kittens.

Some kitten parents complain that the powder doesn’t easily dissolve, which results in a lumpy mixture. This should be avoided, since ingesting the dry, undissolved powder can lead to constipation.

To get a perfectly mixed solution, first mix the powder with a bit of cold water. This helps to create a smoother mixture. When you are sure all of the formula has absorbed water and there are no lumps, you can add warm water to dilute it to the desired consistency. Leave it for a few minutes to allow the milk powder to dissolve.

Once mixed, the milk replacer can be kept in the refrigerator for up to 24 hours. Simply reheat it when you are ready to start the feeding.

Nutrients
Moisture5%
Protein*min. 44.2%
Fat*min. 26.3%
Fiber*max. 0%
Carbs*approx. 21.1%
Ash*approx. 8.4%
Caloriesapprox. 74 / 100g
Allergensmilk, corn
* on a dry matter basis
What We Like
  • Contains probiotics
  • Closely matches queen's milk
  • No artificial flavors
  • Also comes in a liquid, canned version
What We Don't Like
  • Contains cow's milk and corn syrup
  • Difficult to mix
  • Improperly mixed formula can cause constipation

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Best Kitten Milk Replacer For Orphaned Kittens: Well & Good Milk Replacer Powder For Kittens

If you are raising an orphaned kitten, or your kittens are less than three days old, your best option is to give them a kitten milk replacer that contains colostrum, like Well & Good Milk Replacer Powder for Kittens.

As we explained, colostrum is essential to a kitten’s survival, since it supports the immune system and helps to mature the gut. If your kittens are malnourished, or you at all suspect that they might not have gotten their mother’s milk for the first two days of their life, then give them this formula.

Well & Good KMR does not contain cow’s milk, so it is easy to digest and won’t cause loose stools because of lactose intolerance. Unfortunately, it does contain corn syrup, which some cats are allergic to.

The only real downside to this kitten milk replacer is that it doesn’t seem to contain any Vitamin E, which is essential for a good immune system and the production of red blood cells. Therefore, we advise you to switch to PetAg KMR as soon as your kittens have gained enough weight.

Nutrients
Moisture5%
Protein*min. 44.2%
Fat*min. 26.3%
Fiber*max. 0.2%
Carbs*approx. 20.8%
Ash*approx. 8.4%
Caloriesapprox. 450 / 100g
Allergenscorn
* on a dry matter basis
What We Like
  • Perfect for orphaned or underfed kittens
  • Contains colostrum
  • Closely matches queen's milk
  • Does not contain cow's milk
What We Don't Like
  • Contains corn syrup
  • Doesn't contain Vitamin E
  • Doesn't contain probiotics

Best Kitten Milk Replacer For Weaning: PetAg KMR 2nd Step

Once your kittens are four to six weeks old, you can start the weaning process. Not all kittens will be immediately ready for this, whether they are bottle fed or feeding from their mother. Depending on your kittens, you can use a weaning formula, like PetAg KMR 2nd Step.

PetAg KMR 2nd Step contains all the nutrients that kittens from four to eight weeks old need to grow and develop further into cats. The texture is a bit more grainy than the regular KMR, which gets the kittens used to eating more solid foods.

Because of the extra nutrients, this formula is also perfect for older, underweight cats that suffer from illness or allergies. PetAg KMR 2nd Step is an easily digestible way to give your cat the calories they need to keep up their health.

Like the regular KMR, 2nd Step KMR contains cow’s milk. Again, if you notice your kittens getting diarrhea after switching to this formula, try a different one as they are likely lactose intolerant. A great alternative for kittens older than four weeks is goat’s milk.

Nutrients
Moisture8%
Protein*min. 37%
Fat*min. 12%
Fiber*max. 4.3%
Carbs*approx. 38%
Ash*approx. 8.7%
Caloriesapprox. 360 / 100g
Allergensmilk, rice
* on a dry matter basis
What We Like
  • Great weaning formula
  • Works for sick and old cats
  • Perfect for underweight cats
What We Don't Like
  • Can cause severe diarrhea
  • Contains cow's milk and rice
  • High carb content
  • Contains artificial flavors

Best Affordable Kitten Milk Replacement: Hartz Kitten Milk Replacer

If you foster kittens regularly or are taking care of a larger litter, you might be looking for a more affordable way to keep them all fed. Hartz Kitten Milk Replacer is a great option to consider.

Hartz KMR does not contain cow’s milk, so you don’t need to worry about runny stools with this one. And kittens seem to love it! This might be because of the artificial flavors, though. It also has a very sweet smell that reminds me of strawberries. Not exactly what you would expect from a kitten milk replacer.

This product has a rather high fat content than most KMR products, so make sure you don’t overfeed your kittens. Stick to the instructions, though, and you should be fine.

Nutrients
Moisture5%
Protein*min. 31.6%
Fat*min. 42.1%
Fiber*max. 0.8%
Carbs*approx. 17.1%
Ash*approx. 8.4%
Caloriesapprox. 500 / 100g
Allergensnone
* on a dry matter basis
What We Like
  • Affordable
  • Does not contain cow's milk
  • No allergens
  • Cats love it
  • Works for sick and old cats
What We Don't Like
  • Not for newborns
  • High fat content
  • Has a very sweet smell
  • Contains artificial flavors

Best Liquid Kitten Milk Replacer: PetAg PetLac Kitten Milk Replacement

Some kittens don’t take to the powdered formulas as well as they should. Or you yourself might not be up for all the measuring and mixing that is involved. For those cases, we advise you to use a liquid formula, like PetAg PetLac Kitten Milk Replacer.

A liquid milk replacer tends to be easier to digest than a powdered formula. So if your kitten has a sensitive stomach or gets constipated easily, you should definitely give this a try.

Like PetAg KMR, the PetLac Kitten Milk Replacement also contains cow’s milk. If your kittens don’t fare well with this, try a liquid milk replacer that contains goat’s milk instead.

Compared to most powdered formulas, PetLac contains less protein and more carbohydrates. This is less than ideal, because it can cause your kitten to grow more fat than muscle mass. If you are feeding your kittens PetLac, keep an eye on their weight and try to make the switch to wet food a little sooner.

Nutrients
Moisture85%
Protein*min. 30%
Fat*min. 33.3%
Fiber*max. 1.3%
Carbs*approx. 26.7%
Ash*approx. 8.7%
Caloriesapprox. 74 / 100g
Allergensmilk
* on a dry matter basis
What We Like
  • Great alternative to powdered formula
  • Easy to use
  • Easy to digest
What We Don't Like
  • Contains cow's milk and carrageenan
  • Less protein/more carbs than powdered version
  • Short shelf life

Our Top Picks: PetAg KMR and Well & Good Milk Replacer Powder For Kittens

Our pick for the allround best milk replacement for kittens is PetAg KMR. It has basically become the industry standard in kitten milk replacers, and for good reason. The large majority of kittens do wonderfully on this formula that is designed to give them the best shot at a healthy life. Plus, it is a great source of extra nutrients for older and sick cats.

However, if you are fostering orphaned kittens, we think Well & Good Milk Replacer Powder For Kittens is the better choice. The added colostrum will help their immune system and digestive tract, and greatly increase their chances of survival.