I've made standing bears, Elma, and have used a couple of different methods. Becky is correct about putting weight in the feet and firmly jointing the legs. One way is to cut a piece of cardboard slightly smaller than the foot pad pattern piece, then slip it into place after sewing the pad to the foot/leg pieces. Then you can add your filling materials to the foot. To add a little more weight, I used BBs along with whatever other filling materials you choose to stuff the leg. (Most of the BBs would go in the foot.) The other method is to skip the cardboard, but make sure you distribute the BBs and other filling evenly in the foot so you can shape the pad to make it flat. Hope this helps.
Hi Emma I'm quite new to teddy making but most of my beard are standing bears. Not sure if there is a correct way of doing it but I make sure my leg joints are really tight and stuff legs quite firmly and use ball bearings wrapped in stuffing to go in the feet. I also use ball bearings in the bottom and the tummy as I find this helps them to balance. Hope this helps