Baby (Birth – 2 Years Old) – Infant Development & Parenting Tips We hope that parents will be able to provide the necessary support, encouragement, structure, and interventions to enable their child to progress through each phase as smoothly and successfully as possible based on their child’s unique set of traits and interests. Our goal is to help parents understand what is happening in their child’s brain and body during each period. Growth and maturation occur in the primary developmental domains during each stage, including physical, intellectual, language, and social-emotional. “Ages and Stages” is a term used to outline significant periods in the human development timeline. However, environmental circumstances and exchanges with key individuals within their environment significantly influence how each child benefits from each developmental event. What occurs and approximately when these transitions transpire are genetically determined. During each of these stages, multiple changes in the development of the brain are taking place. Children go through distinct periods of development as they grow from infants to young adults.