Children are more vulnerable to climate change due to their developing physiology. Poorer and marginalized children in lower income countries are most affected. Climate change is increasing health risks like dengue fever and diarrhea. 1.7 million child deaths per year are caused by environmental pollution and climate change impacts diseases that harm children's health. Over half a billion children live in highly flood-risk areas and 300 million breathe toxic air. Adaptation is needed to build climate resilience for children's health, well-being, and education.