I am no expert by any means, however I would just keep an eye on your Baby and perhaps feed in a separate container next time or put down newspaper or tile for the feed time I would think it would poo it out (depending on amount/size etc)
What do you think happens to them in the wild? They don't necessarily eat on top of a nice clean rock ledge all the time. I am sure they would eat no shortage of leaf matter or dirt etc, I wouldn't be too concerned but keeping an eye him isn't going to do any harm.