Why a ridiculous question? The blitz also was an intensive air war aiming to break the enemy. But unlike today, it was carried out with dumb bombs instead of precision guided munitions. And PGMs have ended up being far deadlier to children than the 1940s dumb bombs.
Not much. The Blitz was a tertiary thing the Nazis did (the death toll of the Allied air war on Nazi Germany was a lot higher); in contrast, the air war in the first three weeks of the Gaza War was the deadliest phase of the conflict, because it was a prelude to a regular modern military operation.
At the time, the German high command did not view it as tertiary, but as a prelude to a ground invasion of Britain. Just the way you describe the first three weeks of the IDF bombing of Gaza. So the question remains, why was the modern precision bombing campaign so much deadlier for children?
(Because the Nazis engaged in actual genocide, whereas the IDF is engaging in a ground war, transitioning to a counterinsurgency, with looser rules of engagement than the US would prefer, and comparable lethality to the Iraq War.)
To try to understand what drives the lethality towards civilians and children of particular air campaigns. The Gaza air campaign uses guided munitions, and despite that it has been far deadlier to kids than the indiscriminate bombing of the Blitz.
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The Assads killed hundreds of thousands of their own people, and Palestinian refugees on top of that.
And they did that ON PURPOSE.
https://www.iwm.org.uk/history/growing-up-in-the-second-world-war#:~:text=At%20the%20start%20of%20the,killed%20and%207%2C622%20seriously%20wounded
“According to Hamas”
I would think that the overall number is simply what matters.