I had a similar scare, my little boy was going back into his cage though, he caught his foot momentarily, but got it out immediately. Luckily, he didn't seem to hurt it because he was back on that foot immediately. Scared me out of a few years, though. from that moment on, I would put a piece of cardboard or an extra plastic ramp that came with the cage - worked like a dream! I agree though, I think that if your baby is using the foot, it's probably not broken - can you see any swelling at all? I would think that if he's using it ok and there's no swelling or it does not look deformed in any way, you might just want to watch him for a couple of days. If he developes problems or you notice any difference in that foot, Run Forrest, Run!! Don't beat yourself up though, these little ones are lightning fast, and can be wild as march hares. You've just got a case of the "good mommy guilt", and that's not a bad thing. If you find at times that you wonder if you're a good mom or even worry that you're not, it's just that you ARE a good mom. If not, it would be a different story. Please let me know how he's doing.