Mine are now outside in a pot, and about 3-4 inches tall, and so far doing fine, even with all the heat that we are having here. They are not really fast growing, so they should be small enough that I can bring them inside this winter.
My little banana trees are barely growing, too. They are getting new leaves, but are still only about a foot tall, so they are definitely not going to give me any shade this year. Ar, at least not very soon. They seem healthy enough, but I did expect them to be faster growing.