Do we need another novel about baby siblings? Maybe not--but if that's the terrain Kevin Henkes wants to explore, I'm ready to go. Henkes's new book, "Oh Sal," opens with a little girl who is irritated. She can't tolerate the presence of the new baby, and it especially bugs her that that baby doesn't have a name. ("Get with it; make a choice, Mom." Sal wanted the name "Spritz"--after her favorite cookie--but her mother laughed at the suggestion. Derisive laughter! Annoying!) To complicate matters, Sal's obnoxious uncle arrives for a visit. This guy calls Sal "Salamander," although she has indicated her distaste for the nickname. Also, he doesn't have a present. When Sal asks about this, he rolls his eyes and says, "My ARRIVAL is the present!" Finally, Sal's favorite new undies are missing; they have images of poppies, along with the word "Poppy." They were a gift from Santa, not from Mom or Da...