This is about as cute as it gets.
A video making the online rounds this week reveals a special moment for a young family. When it came time to tell their daughter that they're expecting another baby, the parents used a t-shirt reading "I'm the Big Sister" to share the joyous news.
It takes awhile to get the message across, and thus the video goes on for several minutes. When she figures it out, though, the precious reaction is worth the wait: