When I worked in a portrait studio five or so years ago, one of the things they always pushed us to do was to get people to bring their own props from home. Why? A photo means a lot more if you are hugging the teddy bear you have had since you were born than if it is some random studio prop.
When I schedule appointments of children I always ask if they have a favorite stuffed animal or doll. Even if you just snap a few pictures of them with their favorite toy and the majority of the session focuses elsewhere, they are going to be happy one day to have those precious childhood memories.