I voted yes. But the truth is that i dont think we'll ever see any zombie kids, in any game of the genre. Question of mortality i guess, or incomfort. There would still be too much people offended and even outraged by seeing anything ressembling children getting shot, even if they're not kids anymore, by being zombies, that developers would surely remove them. I personally think it would add a lot of weight and horror to the dramatic tone. The feeling of despair and the shock, triggered by seeing that even kids were condemned to such horrible fate, would be intense and accentuate immersion.
Thinking of it, we do see babies and pre-teens turned into Necromorphs in the Dead Space franchise... So maybe its not entirely impossible to see zombie children some day.