It seems we are going to have to get Sierra a rocking chair. There's a mini child-size one at my parents' house that belongs to Harmony. (It belongs to Harmony currently, but I seem to remember it being around for a long time) Sierra spent a lot of time in the rocking chair during our visit. She would crawl over to it, push it around, climb up in it, sit in it, and try to stand in it until someone stopped her. She loved it.
Then, when we stayed with Kelley, Mark, and Kate last weekend, Kate a little rocking chair too! Kate's is a little taller, so not quite at stable (how stable can it be, really, it's a rocking chair). We ended up having to put it on its side because Sierra just would not stay away from it and we didn't want her to tip over.
Where can I find a tiny rocking chair?