I am having trouble finding a western youth saddle to fit my daughters horse! He's 13.2 hands but has a very round belly and mutton withers! Pony saddles do not seem to fit because they are too small for him and I need a 12' seat for her.I dont want to spend alot of money as I know she will outgrow this saddle in a year or two.

If the pony saddles dont fit then you need a full qtr. bar. Take a look at the Abetta synthetic youth saddles. They are a nice saddle and light weight for the kids and they are really resonably priced!  They start at about $350.00. You can find  them in colors or with colored trim which the kids love!