Video: 5-year-old distraught after learning baby brother has to grow up

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Being a kid is tough these days.

And when little tikes learn they grow up, life gets even harder.

That is what happened to Sadie here.

She learned her baby brother will one day grow up.

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

Her little brother can only respond with a smile.