When do they slow down???

Ok, this morning I was getting Hunter ready to go to Funtastic and we were putting on his sandals and he fought me tooth and nail. So, I decided it was time to take another trip to the shoe store after his nap. Well, our son no longer fits in his 6 1/2 double wide shoes. He now wears a size 8 double wide!!! The lady at the store assured us that he had some growing room and these shoes should fit for 3-4 months. I really hope so! We are going to go broke spending money on shoes and clothes for this boy! When on earth do they slow down in the growth department?