What to Feed Newborn Puppies and Kittens? — From Colostrum to Weaning

ImmunityQ&AMeongsiljang Veterinary Advisory Board

We’ve put together a guide to nutrition management for newborn puppies and kittens under four weeks of age. We’ll cover the importance of colostrum, how to choose the right milk replacer, proper feeding positions, and weight monitoring, sharing practical tips for each step.

What Is Neonatal Nutrition for Puppies and Kittens?

Newborn puppies and kittens nursing from their mother on a blanket

Neonatal nutrition refers to the comprehensive early-stage care for puppies and kittens under four weeks of age, encompassing the provision of milk, formula, and colostrum, as well as temperature and digestive management. Colostrum intake is critical. If neonates do not consume colostrum within the first 24 hours of life, their immune systems will not develop properly, leaving them vulnerable to rapid deterioration from infections, hypoglycemia, and hypothermia. Nursing from the mother is ideal; if that is not possible, you must substitute with a species-specific neonatal formula designed for puppies or kittens.

Why Neonatal Nutrition Is Directly Linked to Immunity

Newborn puppies and kittens are born with immature thermoregulation and underdeveloped organ function, so even minor mistakes in nutrition or environmental care can quickly lead to health problems. Their digestive systems are also not yet mature, making them more prone to digestive issues and reflux when they become hypothermic or overfed. Additionally, the window for absorbing immunoglobulins from the mother’s colostrum through the intestinal barrier is within the first 24 hours of life. Missing this critical period can result in inadequate passive immunity, leaving them more vulnerable to infections.

Essential Neonatal Nutrition Checklist to Remember

Here are the key points for caregivers to check daily:

Weight Gain: A healthy pup should steadily gain 5–10% of its body weight each day.

Feeding Position: Always feed with the belly resting on the floor and the head slightly raised.

Temperature Regulation: Keeping warm is most critical during the first four weeks of life.

Feeding Intervals: During the first week, feed every 2–3 hours.

Colostrum Intake: The first 24 hours after birth are the golden window for colostrum consumption.

A newborn kitten nursing from a bottle while lying on its belly with its head slightly raised

Go to the Vet Immediately If You See These Signs

In newborn puppies and kittens, conditions can deteriorate within hours. If you notice any of the following—weight loss or no weight gain for over a day, refusal to nurse for more than 12 hours, a cold, limp body, persistent diarrhea or vomiting, or pale or bluish lips and gums—seek veterinary care immediately. Hypoglycemia and hypothermia, in particular, can be fatal within hours, so prompt veterinary attention is far more critical than attempting home remedies.

Milk Replacer Selection: Commercial Neonatal Formula vs. Homemade Alternatives

According to veterinary textbooks, commercially available milk replacers are nutritionally superior to homemade alternatives. Homemade formulas tend to have high lactose levels and are prone to preparation errors, making them particularly risky for inexperienced pet owners. Since canine and feline milk compositions differ, it is essential to use species-specific products; cow’s milk is unsuitable because its composition does not match that of maternal milk. No formula can fully replace mother’s milk, so whenever possible, nursing from the biological mother or another lactating animal should be the first consideration. Even in urgent situations, it is safer to consult a veterinarian and switch to a species-appropriate milk replacer as quickly as possible, rather than improvising with household milk.

Comparison of Species-Specific Milk Replacers and Feeding Tools

Item	Puppy	Kitten
Recommended Nursing Tool	Nipple-tipped syringe or puppy-specific nursing bottle	Kitten neonatal-specific nursing bottle
Feeding Interval (Week 1)	2-3 hours	2-3 hours
Daily Weight Gain Goal	5-10%	5-10%
Cross-Use of Formula	Do not use kitten formula	Do not use puppy formula
Weaning Start Time	3-4 weeks of age	3-4 weeks of age

Based on veterinary internal medicine textbooks. Determine the exact product and dosage after consulting a veterinarian.

Proper Feeding Position and Precautions for Tube Feeding

When feeding, the basic position is prone with the belly flat on the ground and the head slightly raised. Feeding in a supine position, like with human infants, can cause milk to enter the airway and lead to aspiration pneumonia. Tube feeding (gastric intubation) should only be performed after body temperature has returned to normal. In hypothermic states, intestinal motility ceases, significantly increasing the risk of regurgitation and aspiration. Tube feeding should only be attempted under the guidance of an experienced caregiver or veterinarian.

A veterinarian’s hand feeding a newborn puppy with a syringe fitted with a nipple

Temperature Regulation Is Just as Important as Nutrition

Newborn puppies and kittens lack the ability to regulate their body temperature on their own, so keeping them warm is just as important as feeding. While recommended values may vary slightly depending on the source, the general guideline for the ambient temperature in a neonatal environment is approximately 27–32°C (80–90°F). It is recommended to maintain a slightly higher temperature of 29–32°C during the first week after birth and then gradually lower it as the puppies or kittens grow older. However, avoid using heat lamps or electric mats directly, as newborns cannot move away easily and are at risk of burns or overheating. If the mother is panting and appears restless, it is a sign that the temperature is too high. Instead, create a separate, warm, insulated space using several layers of towels.

Timing and Method for Transitioning to Solid Food

Begin gradually introducing solid food at 3 to 4 weeks of age. Start with a porridge-like mixture made by soaking puppy or kitten growth formula in specialized milk replacer, and over the course of 3 to 4 weeks, reduce the moisture content to transition to solid food. Nutritional imbalances during growth—particularly calcium excess—can lead to bone and joint issues, so it is best to use food specifically formulated for growing puppies and kittens and to avoid adding supplements without veterinary guidance. The exact feeding amount should be adjusted based on body weight, breed, and your veterinarian’s recommendation.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can I feed cow’s milk or human infant formula to a puppy if its mother isn’t available?

No, cow's milk is not suitable because its composition differs from that of maternal milk and can cause diarrhea and nutritional deficiencies. You must use a specialized neonatal formula designed specifically for puppies or kittens. Homemade milk substitutes are prone to errors, so in an emergency, please consult your veterinarian and switch to a proper commercial formula as soon as possible.

How many times a day should newborn puppies and kittens eat?

During the first 2–3 weeks of life, neonates spend almost all their time nursing and sleeping, so frequent nighttime feedings are necessary. As a general guideline, feed every 2–3 hours during the first week, every 3–4 hours during the second week, and every 4–5 hours during the third and fourth weeks, though the exact interval should be adjusted based on the individual animal’s condition. It is essential to monitor daily weight gain, which should be 5–10% of body weight.

Should I take my pet to the vet immediately if their weight doesn't increase in one day?

Yes, I recommend it. Body weight is a critical indicator directly tied to survival, so if it remains stagnant for more than a day, it could signal issues such as infection or hypoglycemia. In particular, if you notice signs like a cold body or refusal to nurse, you should bring your pet in for an examination immediately.

What should I do if my puppy didn’t get colostrum?

Colostrum is difficult to replace artificially once the critical window has passed. Commercial substitutes cannot fully replicate the benefits of a mother’s colostrum, so newborns that don’t receive enough colostrum may be more susceptible to infections. Rather than attempting home remedies, it’s safest to consult with a veterinarian for tailored supportive care, including warmth, nutrition, and infection prevention.

Can I give puppy milk replacer to a kitten?

No, you shouldn’t. Puppy and kitten milk formulas differ in their composition of protein, fat, taurine, and other nutrients. Taurine is an essential nutrient for cats, and they are particularly sensitive to deficiencies, so it is crucial to use a formula specifically designed for kittens.