Bun

Cats 18 months and older are known to "loaf" while kittens under 18 months are known to "bun".

Awe, look at mama cat loafing while her kitten is being a bun.

Bun

Cats who are 18 months and older are known to "loaf" while kittens under 18 months of age are known to "bun"

Look at mama cat being a loaf while her kitten is being a bun