Yes they did.

Per this article in the 6 years prior (2015-2021) 10,000 children have died in Yemen due to the conflict, also fueled by American support of Saudi Arabia.

https://www.aljazeera.com/news/2021/10/19/unicef-10000-children-killed-or-injured-in-yemen

Per this Wikipedia page, since 2012 (10 years) a total of 850 children have been killed in Palestine, and that includes deaths from Palestinian militants, not just IDF.

https://en.wikipedia.org/wiki/Children_in_the_Israeli%E2%80%93Palestinian_conflict

You're uh, wrong as fuck or at least willfully misrepresenting data.

Based on the social media presence of this issue, Arabs only seem to care about Arab children dying when its being done by Jews. While I agree with the pro-palestine movement, it seems to be rife with antisemitism and bad-faith actors like yourself that will prevent it from ever becoming mainstream.