Only 3 children died during the Okhmatdyt cancer hospital bombing. Ukraine is a Western country, so children are cherished and not thrown away like rags.
Here, for instance, is Oleh Holubchenko, a heroic Ukrainian doctor who was hit by an explosion wave as he was operating on a child, yet he kept his cool & moved the child onto a handheld ventilator. The child survived. And the doctor went outside to participate in a rescue operation while bleeding from his injuries:

The problem is that there’s no other hospital that can treat these children as effectively. Israel offered to treat the ones who are sick right now, and that’s very good. Western countries need to band together and support each other. But many families will not be able to afford to live in Israel long-term while the treatment takes place.
The destruction of Okhmatdyt is a tragedy that will have repercussions for years to come.