The Year of the Baby by Andrea Cheng

Anna is the only one who can calm her new baby sister when they go to her frequent doctor trips. Kaylee, who was adopted from China, is not gaining weight, and everyone is worried. At school, Anna has trouble deciding on a topic for her science project. When she and her friends discover that Kaylee eats better when she’s distracted by their singing, they wonder if an experiment could win the science fair and help the baby gain weight. Should the songs be in English or Chinese? Does the type of food matter? Cheng follows The Year of the Book (2012) with a charming sequel that asks as many questions as it answers.