I first saw the Bumbo bay sitter seat at my friend’s house in 2008, and got the impression that it’s a very comfortable seat for younger babies who trying to sit up (approx age 6 months old).  I did get some negative feedback from my friends as their active children managed to tip over while trying to get out and that her children’s legs were too chubby to fit in the seat. It didn’t deter me though as I still bought one for my daughter in 2009.