Big brother comforts sick baby sister in heartwarming viral video

A video of a boy comforting his baby sister is warming hearts across the country.

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A video shared to Facebook by mom Danielle Davis of Haughton, Louisiana, shows her son quietly rocking his sleeping sister in his arms when she wasn't feeling well. The video was viewed more than 2 million times on Instagram.

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"The kids adore each other," Davis told "Good Morning America." "He can always make her laugh. They are siblings, so they have their moments of jealousy, but that's to be had. Ninety percent of the time they really very loving toward each other."

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