About half the inhabitants of Gaza are under 18 years old, so 1/3 of the dead being children corresponds to a ratio of two civilians killed for every combatant. This is not out of the ordinary for urban warfare conducted in a manner intended to reduce civilian casualties.
Many people seem to think so but the evidence doesn’t support their argument. A 2:1 ratio of civilians to combatants killed isn’t particularly low but it is far closer to the best that Western armies have been able to accomplish than it is to the ratio seen from armies that are not trying to reduce civilian casualties. For example, Russia’s ratio in Mariupol is approximately 8:1 and that was against Ukrainian soldiers in uniform who weren’t deliberately hiding among civilians. Urban warfare always involves heavy civilian casualties.