don't know whats worse. the fact you said this or the fact that i actually contemplated it for a second.
"children are small. you could easily grab the kid and run like hell."
And then what are you supposed to do, outrun bullets?
I don't know if this really qualifies as "easy", seeing as the kid would weigh you down and would likely be squirming in fear. On top of that you'd need to reach past an armed assailant to get the kid in the first place, and if you're shot that'll probably disturb the little one further.