Mother cats lick their kittens to keep them alive. In the first weeks of life, kittens cannot urinate, defecate, regulate their own body temperature, or even see. A mother cat’s tongue handles all of these problems, serving as a cleaning tool, a digestive trigger, a bonding mechanism, and a source of warmth and comfort.
Stimulating Digestion and Elimination
Newborn kittens cannot urinate or defecate on their own. Their elimination reflexes simply aren’t developed yet. A mother cat licks the belly and genital area of each kitten after feeding to physically trigger urination and bowel movements. Without this stimulation, waste builds up and the kitten can become seriously ill or die within days. This is one reason orphaned kittens require a caregiver to gently wipe the same areas with a warm, damp cloth after every feeding, mimicking the mother’s tongue.
This need lasts for roughly the first three weeks of life. After that, kittens gradually develop the ability to eliminate on their own, and the mother’s licking in that area tapers off.
Building a Shared Scent
Cats experience the world primarily through smell, and this starts from birth. Kittens are born with their eyes sealed shut and their ear canals closed. Only their sense of touch and smell are working, which means chemical cues are their entire map of the world.
When a mother cat licks her kittens, she deposits saliva that carries her scent. She also marks the nesting area with glandular secretions. Over time, the nest accumulates a shared scent from hair, saliva, urine, and skin oils, creating what researchers describe as an “olfactory reference point.” This shared family smell helps the mother identify her own kittens and helps the kittens orient themselves in an environment they can’t yet see. It’s also the foundation for how cats use scent socially for the rest of their lives. Adult cats that live together often groom each other to maintain a group scent, a behavior rooted in this early mother-kitten dynamic.
Starting three to four days after birth, the mother also releases a calming pheromone from glands near her nipples during nursing. This pheromone persists until roughly two to three months of age, just after weaning. It promotes a sense of security in kittens and strengthens the bond between mother and litter. (Synthetic versions of this pheromone are now sold commercially to help calm anxious cats.)
Cleaning and Infection Prevention
A cat’s tongue is covered in tiny, backward-facing spines made of keratin, the same protein in human fingernails. These spines work like a fine-toothed comb, pulling debris, dried fluids, and loose material from a kitten’s fur. Right after birth, the mother vigorously licks each kitten to remove the amniotic sac and birth fluids. This first cleaning session also stimulates breathing by clearing the mouth and nose.
In the days and weeks that follow, regular licking removes traces of milk, urine, and feces from the kittens’ coats. This matters because strong odors can attract predators. In the wild, a clean, scent-minimized nest is a safer nest. Keeping the kittens and the nesting area clean also reduces the risk of bacterial infections on the kittens’ still-developing skin.
Warmth and Circulation
Kittens under about three weeks old cannot regulate their own body temperature. They rely entirely on their mother’s body heat and the warmth of their littermates to stay alive. Licking plays a supporting role here. The physical action of a rough tongue moving across a kitten’s body stimulates blood flow to the skin’s surface, which helps distribute warmth more evenly. It also encourages kittens to move and huddle closer to the mother or each other, which keeps the group temperature stable.
This is also why orphaned kittens need to be kept in a warm environment, ideally around 85 to 90°F in the first week. Without a mother’s body and tongue, hypothermia can set in quickly.
Teaching Grooming Behavior
By around four weeks of age, kittens start attempting to groom themselves. They’ve been watching and feeling their mother do it since birth, and they begin mimicking the behavior. A mother cat’s persistent licking essentially serves as a tutorial. Kittens that are separated from their mother too early sometimes struggle with grooming later in life, either doing it poorly or doing it excessively as a self-soothing behavior.
Licking between cats also carries social meaning beyond hygiene. Adult cats that groom each other are reinforcing social bonds, expressing trust, and maintaining group cohesion. Kittens learn this social language through their mother’s grooming long before they understand it.
Why Some Mother Cats Lick More Than Others
Not all mother cats groom their kittens with the same intensity. First-time mothers sometimes take longer to begin grooming, particularly if the birth was stressful or required human intervention. Cats that were poorly socialized or separated from their own mothers early may also groom their kittens less effectively.
Excessive licking can also be a concern. If a mother is licking one kitten’s abdomen or genital area raw, it may indicate the kitten is having trouble eliminating and the mother is trying harder to stimulate the reflex. In rare cases, an overly stressed or inexperienced mother may lick so aggressively that she injures a kitten. If you notice bald patches, redness, or broken skin on a kitten, it’s worth having a veterinarian evaluate the situation.