This short book was originally published serially online by The New York Times. The story follows Thaddeus, a lonely, smart, and jealous boy who resents his new baby sister. In fact, he thinks she is an alien. When he learns about prime numbers in school and discovers that she only communicates using primes, he begins to think he just might be right.
Prime Baby is the work of Gene Yang, a well celebrated and award-winning graphic novelist and educator. Yang says that it was "inspired by the ruckus at my own house after my second kid was born." He talks more about his life and work in this interview with Tom Surgeon.
This short story has not been as well received as some of his other work. Educator James Bucky Carter called it "fun, relatable, worth reading, but not life-changing or particularly exceptional." Reviewer Johanna Draper Carlson found the book "cute" but had mixed feelings about it.
More reviews, information, a preview, a teacher guide, and author information can be found here from the book's publisher First Second.