The simplest way that I have found to add a frame to your subjects in the home is by using a doorway! This compositional element is one of my favorite ways to compose a shot. It is simple and very effective.
Try this: Set your child up with a favorite activity by a window in a room with a doorway. Let your child get good and engaged in what he is doing. Step outside the room and frame the subject with the doorway. The major advantage of this is you get a 'real' moment...your child being your child without adult influence.
Here are some examples:
Try it, I think you'll like it :)
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