When was my younger brother Gregory born?

<When is my brother Gregory born?> is a new picture book by Gaby Swiaukovska, a rising illustrator who has received international attention after winning the Ezra Jack Keats Book Award, and Kimberly Willis Holt, a National Book Award-winning author. Iris, a girl from the Rococo era of the 18th century, can't help but wonder when the little brother in her mother's womb will be born. Iris, hoping for a younger brother, names him Gregory, and she goes around asking people around her when her younger brother will be born. But... Uncle, grandfather, grandmother, father, the guy next door, and even my friend Jenny! No one can tell you the correct answer to when Gregory will be born, and to Iris, they are all nonsense... Iris thinks about the things she wants to do when her younger brother is born, but until the season ends, Gregory is not born... When will Iris be able to meet her younger brother Gregory?