The phrase "early bloomers" refers to people or things that develop or achieve success earlier than expected or compared to others in their group. Full definition
The article specifically describes an instance in which the Obamas decided to replace a painting of Theodore Roosevelt's wife with Robert Rauschenberg's Early Bloomer [Anagram (A Pun)-RSB-, 1998. (artnews.com)
Then sit back and enjoy the annual show, which often begins with early bloomers like Jacob in December. (rismedia.com)
Some children are early bloomers who enjoy success in sports because they develop faster, not because they have more raw athletic talent. (MomsTeam.com)