Apologies for the rather blunt and forward query but:
How many Uchiha children (estimate or otherwise) did Itachi/Obito kill in the massacre in any given canon.
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Based on my current knowledge, there's no canon answer. Although this quora post seems to dive deep into the nitty gritty of it.
https://www.quora.com/How-many-Uchiha-did-Itachi-kill