When you hire a photographer, usually there will be a waiver to sign. In short they say something like all images belong to the photographer, they reserve the right to use the images to promote their business or however they need, and (usually) you have bought the right to print and share the images.
Don't be afraid to ask exactly how your pictures will be used, and communicate what you are comfortable with. I can tell you exactly how I use the photographs I take - I usually select a few of my favorites from the session, add them to my portfolio and make a blog post about them! I may print some photos to display in my studio, but I do usually let you know about that.
I will not share photos that have any of your information in the photos. (which usually only comes about in fresh 48 hospital sessions) If you are really uncomfortable with certain photos being displayed, just let me know! I will do my best to accommodate you and find some photos that work for us both to put on display.
That said, I photographed this little sweetheart recently.