Prepare Yourself, Because Chris Pratt's Son Is About to Melt Your Heart

Chris Pratt took to Instagram on Tuesday to share a precious video of his 3-year-old son, Jack, in honor of World Prematurity Day. In the clip, Jack colors while wearing a green bucket on his head as Chris and his wife, Anna Faris, sing "Ding-Dong! The Witch Is Dead" in the background. "Today is World Prematurity Day," the actor wrote. "Premature birth is the leading cause of death in children under five worldwide. About 15 million babies are born too soon every year. Nearly one million of these babies die within the first month of life. Support #WorldPrematurityDay and join the millions of volunteers who support #MarchofDimes."

Chris and Anna welcomed Jack in August 2012, which was nine weeks before his schedule due date. The couple has been open about Jack's scary birth in the past, with Anna admitting that she was initially in denial, saying, "For hours I was like, 'I'm just having indigestion.'" Fortunately, after a month-long stay in the hospital, Jack was able to go home completely healthy. See the sweet video below, and then check out the Pratt family's cutest photos.