They've been known to use prop dolls for propaganda videos. Look at the video and tell me that that child is real. The way the face looks(again too waxy) to how they hold the child(body is too stiff) is a dead give away.
Note that I'm only refuting some of these propaganda videos, I'm not denying that children are dying, indeed , they are dying on both sides. But this is war and there always will be collateral damage. Hamas intentionally chooses to maximize it by putting civilians and children on the frontlines.
The below video is a classic example of how the Jihadi brain works. They're even encouraging their little children to become suicide bombers. Why? Because at a fundamental level you're dealing with a mental illness called Islam, an irrational zombie-esque cult that values death more than life itself.