Bumbo seats are really popular at our sales - so i should draw your attention to the recent safety concerns about them.
If you are selling a Bumbo then try and get the harness attachment before you sell to make it more attractive to buyers. If you are buying a secondhand Bumbo (or have already bought one) you should still be able to get the harness from the manufacturer.
....... and remember - don't ever use a Bumbo or similar on a raised surface. If baby isn't strapped in they could fall out