organic/breathable bouncers/swing/babygear recommendations
Most bouncy seats and swings have removable washable poly cotton covers with poly batting. You could get one and sew a layer on top, sew you own, or just add a cotton blanket over top. They all breath pretty well. This is a great thing to get used. My baby rocker was $10, bouncer & small swing $5 from a consignment sale.
Jumper. Mine loved the saucer and the Jumparoo. They have a cloth sling where they sit (the shape of a baby wing) and then what they can play with is plastic. No foam, just a layer of cloth. Again, look for used. My saucer was free because the family just wanted it out of their house.