When Aidan was born, everyone thought he was a girl. But once he came out as a trans boy, Aidan and his parents fixed the parts of his life that didn't fit anymore, and he settled happily into being himself. Then Mom and Dad announce that they're having another baby, and Aidan wants to get everything right for his new sibling. But what does it mean to "get everything right"? And what happens if he messes up? With a little help, Aidan discovers that he already knows the most important thing about being a brother: how to love with his whole heart. When Aidan Became a Brother is a heartfelt story that will resonate with transgender children and reassure any child concerned about becoming an older sibling as it celebrates the many transitions a family can experience. -- From dust jacket.