* Defining "kid" is tricky: What age range counts as a kid? Is it under 18? Under 12? The definition varies.
* Population data changes constantly: Birth rates and death rates fluctuate, so the number of kids changes all the time.
* Data collection is imperfect: It's difficult to get accurate population data, especially in remote areas.
However, you can find estimations:
* UN World Population Prospects: The United Nations publishes reports with population projections, including breakdowns by age group. You can likely find estimates for the number of children in a specific age range.
* World Bank Data: The World Bank also provides data on child populations.
Remember, these are just estimates, and the actual number of kids in the world is always changing.