WATCH: 5-year-old crushed after finding out little brother has to grow up

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Five-year-old Sadie is having a tough time growing up, and it was made more difficult when she realized her little brother will not be a baby forever.

“Oh, you are so cute! I love your cute little smiles. Oh my gosh! I want him to stay little!” she said through tears.

The baby responds like only a baby can. With a smile.