This is a great site, Lily. To think, babies and children are always put on upholstered surfaces.
Stealth (unlabeled) bromide is everywhere as fire retardants -- and there are non-toxic fire retardants available but they're not as cheap --and the bromide manufacturers are huge pressure groups.
With stealth bromide, there is no way you can get enough Iodine from food or kelp, no matter how pure you eat. It's not 1975 anymore, the pre-bromide ages.