Functional textiles and clothing designed for children should provide a safe and supportive environment, encompassing comfort, safety, health, wellbeing, and cognitive development, as well as fostering interaction and exploration. This study explores the multifaceted nature of functional textiles and clothing for children. It emphasises the importance of comprehensive knowledge about the user and an interdisciplinary approach in the design process. The integration of expertise from diverse fields contributes to a holistic understanding of the challenges and opportunities inherent in creating clothing that satisfies aesthetic demands and promotes the wellbeing of children. Through a study of existing research in functional textiles and a market analysis of children’s clothing, this research underscores the importance of practical application of studied materials and technologies in children’s fashion, creating innovative and purposeful solutions. This collaborative effort involves working with multidisciplinary teams and applying designers’ updated knowledge of functional materials throughout all stages of the design process. The study emphasises the designer’s responsibility in articulating the essential knowledge needed to integrate functionality from the beginning of the design process, ensuring that practical considerations are integral to the core attributes of the clothing. The study also proposes a framework that represents the design process for functional children’s clothing.