Marguerite , the Pisang Ambon seems to be well on its way. Just baby it till it becomes a "real" banana plant and you've got it made.
I've had a few that have behaved like the Pisang Raja( some currently in the front porch), from the picture it seems to be ok maybe it just needs to develop some roots before the top grows. Keep it warm and properly watered and it should be fine. Well done!
