Re: Superundies or Antsy Pants or other??
We tried Superundies for my 5.5 year old son but they didn't work for us- they would wick really bad and there really isn't much room to add extra absortion. We now use Tinkle Time overnight solutions (stuffed with 2 flats) and he hasn't has a leak since (he is in size 6). You could always see if Hope at Ladder Hill Designs will make a larger pair of TTT for you or if she has any in stock.
SAHM to three wonderful monsters: Tyler 6, Alli 4 and Jilly Billy 2. And all I have to say is thank God for wine!