Second Daughter doesn't spend that much time in the swing. As you might guess from the picture, First Daughter is often hovering, "helping" with little pushes and playing with the fishes herself. She does seem to like it, though, at least for short bursts of time.
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I should add a do not attempt warning for first time parents. Technically, Second Daughter should be buckled in. The manufacturer would insist on it now...I'm inclined to worry about it more when she can really move around a bit. Of course, I might worry more if we actually left her in the swing very often, but it's usually just long enough to wash hands or something.