Little girl is devastated when she learns that her baby brother will grow up

Now this is what you call sisterly love!

Five-year-old Sadie is left devastated when she learns that her adorable little brother will one day grow up – and she in NOT happy. At. All.

The video, which was posted to YouTube by Alex Miller, sees the five-year-old bawling crying as she gently hugs her baby brother, and gives him a sweet kiss on the head. 

"Oh, you are so cute. I love your cute little smiles," Sadie roars as she cuddles into the baby. 

"Oh my gosh! I want him to stay little." 

(She also doesn't want to die when she is one hundred, but that's another story).

And as the tears take over, her baby brother just sits and smiles at his sister – no doubt wondering what exactly is going on!