Children are in a constant state of growth and development, requiring more nutritional and caloric support to maintain an anabolic state. This chapter explores the intricate relationship between pediatric respiratory conditions and nutritional needs, focusing on cystic fibrosis, bronchopulmonary dysplasia, mechanical ventilation, and asthma. Pediatric patients with these conditions face unique challenges, including increased metabolic demands, growth delays, and the risk of malnutrition or overnutrition. Emphasis is placed on individualized nutritional strategies to support growth, improve respiratory function, and enhance overall outcomes. This comprehensive approach underscores the critical role of nutrition in managing pediatric respiratory diseases and optimizing long-term health outcomes.