I can't really help in regards of markets in Sydney, but I do the Baby & Kids markets here in Brisbane, Mathilda's and a Boutique Market one a month. The hard part is finding the right market for you and your products and this may mean going to a few to find that right one.
Sorry not much help but I do find the Baby & Kids markets a little quiter than normal leading up to Christmas as most shoppers are looking for cheap toys for Christmas. Maybe try them again next year.
Tennille