The thread does seem to hold it's shape pretty good. I still have to make the front of the medallion, but it looks like I have found a new thread for my larger doilys. Although in retrospect, I should order it in a size larger than the 30 here. I'm not sure that when finished it would actually fit a baby's foot. LOL.. Maybe the next size up will tat up big enough.
EDIT: Rather than make another post I've added to the original..
Here is the booty finished but without the ends hidden.