Wouldn't use it for a bubba under 4 months myself. We have one. I think it was not anything more than "ok". It's really only useful for a short time (for us only a couple of months). The baby must be able to hold his/her head completely unsupported before they can go in it. We were told it was suitable up to 12 months. However once bubbas can sit on their own, they are not keen to be in there. So for us it was really only good for a short time. Gussy is a Mr Independent and would get really frustrated at being "trapped" in one place at quite a young age. But that was the same with our rocker chair. He preferred the Bumbo to the rocker. But overall his preference was to be playing on the floor.