This visualization from the same source answers your question: https://ourworldindata.org/where-are-children-dying https://ourworldindata.org/where-are-childre

This visualization from the same source answers your question: https://ourworldindata.org/where-are-children-dying https://ourworldindata.org/where-are-children-dying In summary, it's highly disproportionate, with rapidly industrializing nations in Asia representing a huge portion of the decline in child mortality.