07/08/2014 06:04 pm ET Updated Jul 09, 2014

Boy's Lullaby To Baby Brother Sets 'Sibling Love' Standard Impossibly High

"This is a whole new level of cute."

That's how an astute YouTuber described this adorable video of a 6-year-old boy cradling his baby brother in his arms and singing him a lullaby.

"Best big brother ever!" declared another netizen after watching the clip.

The video, which was first uploaded in December, has experienced a viral resurgence this week after being shared by a number of news outlets. As of Tuesday afternoon, it had been viewed more than 600,000 times.

Watch the video above and prepare for super-cuteness.