If my memory isn't as faulty as it usually is... kid!fic for the Steve/Tony fandom includes:

All that Remains (http://kijikun.livejournal.com/760523.html?mode=reply)

Meet the Time as it Seeks Us (http://ailette.livejournal.com/12726.html)

And Moth (http://pandax-pro.livejournal.com/794.html#cutid1)- though right now Moth is more Tony's pregnant and less there's a kid-- but if you want a kid- try Mothoween (http://pandax-pro.livejournal.com/10566.html#cutid1) :D

xoxo