What were the of all children?

There's no single answer to "what were the *of all children*." The phrase is incomplete and needs context. To answer, please clarify what you want to know about all children. For example, are you interested in:

* The rights of all children? (e.g., the UN Convention on the Rights of the Child)

* The number of all children? (This is a constantly changing number and requires specifying a time period and geographical area)

* The average height/weight of all children? (This varies greatly by age, sex, and nutrition)

* The overall health of all children? (This is a complex issue with significant global variations)

* The education of all children? (Access to and quality of education differs widely across the world)

Please rephrase your question to be more specific.