Pregnant Cat Nipples vs Normal Cat Nipples: The Difference (With Infographic)

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If you want to know the difference between a pregnant cat’s nipples and a normal cat’s nipples, it’s important to learn a more about how nipples typically work and how they develop.
At a Glance
Overview of Normal Cat Nipples
Anatomy of a Cat’s Nipple
Cats usually have six or eight nipples arranged in pairs along their bellies. More rarely, cats might have four nipples, 10 nipples, or an odd number of nipples. This layout makes it easy for cats to nurse multiple kittens at once.
Each nipple is right in front of a mammary gland. Mammary glands are small and dormant in a normal (non-pregnant/nursing) cat. Each mammary gland has several ducts that connect to the teat canal. A healthy cat shouldn’t produce milk or discharge except when pregnant or nursing.
Before pregnancy, a cat’s nipple is small and hard to find. Each one looks like a tiny pimple or flap of skin. There might be a small amount of bare skin around the nipple, or fur might come right up to the edge of the nipple. Nipples are usually hard to find under a healthy cat’s fur.
Nipples in Male Cats
Male and female cats have nipples, just like humans. They develop before the hormone changes that give kittens male or female anatomy. For male cats, nipples don’t have any real use; they’re just a leftover from the development process.
At a glance, male cats and female cats have similar nipple anatomy. Male cats even have the same mammary system as females! However, male cats have slightly smaller and less developed nipples and mammary glands.
Overview of Pregnant Cat Nipples
During pregnancy, changes occur in a cat’s nipples so she can nurse her kittens when they are born. What a cat’s nipples look like depends on the stage of pregnancy. We can divide nipple changes into early, late, and post-pregnancy (nursing) stages.
Early Pregnancy
Nipple changes are one of the first signs of pregnancy in cats. When a cat becomes pregnant, the eggs implant around day 10–14, and shortly after that, the nipples begin to prepare for nursing. At around 2 weeks into pregnancy, the mother’s nipples will enlarge and darken. They will become a fleshy pink color darker than the surrounding skin and double or triple in size.
The area around the nipple also changes. In early pregnancy, a patch of hairless skin develops around the nipples, making them easy to find. At this stage in the pregnancy, nipples usually don’t discharge any fluid.
Late Pregnancy
Throughout your cat’s pregnancy, the nipples continue to become more prominent, although the most significant changes have already happened. As your cat’s belly swells, the patch of skin around the nipples continues to grow. The next change occurs around day 60–65, or about two days before the pregnancy ends.
At this point, small amounts of clear or milky discharge might begin leaking from your cat’s nipples. This leaking might happen on its own or when the nipples are touched or pressed. This discharge is normal and a sign that the mammaries are ready to go into full milk production whenever needed.
If you don’t see any discharge, don’t worry—not all mother cats produce it in noticeable amounts.
Post-Pregnancy (Nursing)
After the cat gives birth, her nipples are stimulated to produce milk by nursing kittens. At this point, her mammaries are in full milk-production mode. The area around the nipples will be enlarged because the milk ducts are full of milk. The nipples will continue to be darker and bigger than normal for as long as the kittens are nursing.
Kittens wean gradually if left to their own timeline. The mother cat will encourage them to eat food instead of milk over time, and her nipples will slowly return to normal. If nursing suddenly stops, the mother might be at risk of developing mastitis (a painful inflammation of the mammary gland with or without bacterial infection) due to the accumulation of milk.
This is another reason why kittens need to be gradually weaned. Within a few days to a few weeks, after nursing has stopped completely, the mother’s nipples will return to their normal size and coloration.
Normal Nipples | Early Pregnancy | Late Pregnancy | Post Pregnancy | |
Nipple Size | Small, barely noticeable | Enlarged | Enlarged | Swollen |
Nipple Color | Similar to skin | Much deeper pink | Much deeper pink | Much deeper pink |
Nipple Discharge | None | None | Occasional milky fluid | milk |
Area Around Nipple | Fur comes almost to the nipple | Growing amounts of hairless skin | Growing amounts of skin—nipple easily visible | Enlarged from full ducts beneath |
Conclusion
As you can see, feeding kittens is no simple task. The process of preparing milk for nursing is a wonder of biology. The changes that happen to a mother cat’s nipples during pregnancy are some of the most consistent signs of pregnancy in a cat, a surefire sign that kittens are coming. These transformations, from tiny flaps of skin that are barely visible in a normal cat to mammaries full of nutritious milk, are incredible!
- See also: 11 Best Cat Foods for Pregnant Cats
Featured Image Credit: Left: Lenar Musin, Shutterstock | Right: Jim Black, Pixabay