As part of a large study aiming to understand how kindergarten children in Colombia used translanguaging during independent play, Paula (the teacher) along with Dr. Moses (lead researcher) co-designed a 6-week play-based intervention that included a variety of learning experiences such as partner reading, small-group reading, and supported play, among others. In this guide, we describe the step-by-step process followed to design the children's book the students used during instruction to learn the desired language, vocabulary, and interactions. Additionally, we provide suggestions on how to create a book that fits your teaching goals.