Animals,CatsOCT 7, 2026

38 Before-And-After Photos Of Kittens Who Took ‘Growing Up’ Very Seriously

Every cat owner remembers that first night: a kitten small enough to nap in a cereal bowl, crying at a volume that seemed physically impossible for its size. You promised to protect this fragile little creature forever. A year later, the fragile little creature sleeps in the middle of the bed, and you sleep on the edge.

The speed isn't your imagination. Kittens do most of their growing in the first six months, roughly doubling their weight every few weeks. Most are fully grown by their first birthday, at around 10 pounds. Then there are the overachievers. Maine Coons can keep growing for three to five years, and a full-grown male typically weighs 18 to 22 pounds, which is about what a one-year-old child weighs and considerably more than anyone signed up to carry up the stairs.

The owners below kept the receipts: photos of the same cat before and after it discovered its full potential. Scroll through, and if your own palm-sized kitten has turned into a small child with whiskers, share the evidence in the comments.

#1

Before-and-after photos of a scruffy grey kitten growing up into a healthy grey cat licking its nose

"We found Gouda in the middle of a busy road with a horrible upper respiratory infection and her eyes crusted shut when she was about 4 weeks old. She’s now 1 year old and 13 pounds of love. I didn’t want a cat, but now I can’t imagine being without her."

64ranch

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45points

#2

Before-and-after photos of a tiny orange kitten that grew up to fit inside a McDonald's nugget box.

"Nugget —> 20ct Spicy Chicken McNugget Sharebox."

savkennedy15

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42points

#3

Side-by-side comparison of a grey fluffy kitten growing up into a very large, fluffy adult cat

"Little Maui"

krisbuenger

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41points

#4

Comparison of two kittens, one grey tabby and one orange, cuddling on a sofa as babies and later as grown-up cats.

"My orange boy Ben was a scrawny little kitten. His adopted sister is a week older than him and she made him look small. Now, he’s more than twice her size."

lynnzimm

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40points

#5

Before-and-after photos of a tiny calico kitten growing up into a fluffy, white-bellied adult cat.

"The runt of her litter: Yuka. She went from a tiny little thing to a 23-lb monster. (She’s on a diet and has now gotten down to 14 lbs. Clap for her!)"

v1chick_

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38points

#6

A ginger kitten cuddling a pug side-by-side with them growing up and cuddling as adults

missberry1956

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35points

#7

Before-and-after photo of a white and grey kitten sleeping on a blue blanket, and later as a grown-up sleeping cat.

"He grew into the thumbs."

carrielikethebook

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35points

#8

Before-and-after photos of two black and white kittens playing and then growing up to look out of a window.

"My tiny babies became big neighborhood watchers."

lindaskyler_hope

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34points

#9

Before-and-after photos showing a kitten cuddling with a dog and later as a grown cat resting together

kristin_larose

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33points

#10

Before-and-after of a tiny fluffy orange and white kitten who grew up into a long, majestic adult cat.

"One year apart."

maharanity

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32points

#11

Before-and-after photos of a tiny orange kitten growing into a large fluffy cat held by its owner

hbandmutt

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31points

#12

Before-and-after photos of a fluffy orange kitten growing up into a majestic, long-haired adult cat.

"No comment."

blathjewellery

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29points

#13

Before-and-after photos of a fluffy black and white kitten being held up, growing up into a larger cat

"Still palm sized, with more fluff."

alices_wunderland_

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29points

#14

Before-and-after photos of a tabby kitten inside a colorful bag growing up into a big cat in a cardboard box

"From 'butter wouldn’t melt' to 'I break boxes with my hefty self.'"

mooglove

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29points

#15

Before-and-after photo of a tiny calico kitten growing up into a plump, beautiful calico cat

"Artemis. She was so cute and sweet, and now she becomes a monster at 4:40 a.m. and tries to destroy everything I own."

musicalheather

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27points

#16

Before-and-after photo of a young girl holding tiny kittens growing up into a teenager with a large cat

"On the left, my daughter is holding both cats when we got them. Pay special attention to Marble, the grey tabby on the right. In the next picture, my daughter is holding Marble, aka Mr. Chunkybutt, three years later. He’s been that size since the end of his first year."

movieman1979

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26points

#17

Before-and-after photo of a sleek grey kitten growing up into a majestic adult grey cat

"She was so small when I found her that we used a dish towel as a blanket, lol. Now she’s grown and full of sass, attitude, and straight-up cuteness. Peep her looking at her siblings like they don’t have any sense."

wholeandheard

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26points