It's always hard to watch your baby brother or sister grow up, especially if you actually love them.

5-year-old Sadie from Phoenix, Arizona was videotaped crying because the very thought of her 3-month-old brother growing up was just too much for her to handle, according to NBC News.

"I love your cute little smiles. Oh my gosh! I want him to stay little," stated little Sadie as she wrapped her arms around her little brother.

Baby Carson just smiles at his sister in the video, enjoying the kisses she gives him as she sobs about how he'll eventually grow up.

In the course of the video, Sadie takes a moment where she worries about getting older and "dying when she's a hundred" as well.

"She's cried about not wanting to get older herself in the past, but this was the first time she was upset about her brother. The funny thing is that this was totally out of the blue - we have no idea what prompted it," stated Sadie's father, Ryan Miller, in a statement provided by his brother Alex Miller.

The video was posted to YouTube on Monday and has already gathered 17 million views.

Watch the adorable video below: