Honestly the "best" gift varied with the client. For example, once I worked with a teen who had nothing - no money, nothing - she was struggling, and I was her volunteer doula - when I went for the postpartum visit she gave me a bouquet of flowers (they weren't expensive and came from the grocery store, but they meant the world to me). I have also been given photos which mean the world to me especially the photos I get throughout the year!!! I have one client who sent me a newborn photo, Christmas card with photo, one year photo and even got a photo of her and her new sister even though they moved away. Other things I have gotten - candy, cards....honestly everything I have been given is cherished and unexpected. I would suggest something from you heart because you can't go wrong, and I am sure they will appreciate anything you give them!!!