It's a bumbo seat. We got ours on Ebay from this person, http://www.bumbochairlady.com .
It worked SUPER for my brother. We used it for a couple months and that's all my brother needed. We got it and within the first 10 days, there was a HUGE difference in my brother. At first he could only sit in it for about 5 minutes (we did this, so it wouldn't be too much for him, as he was very week) and within those 10 days, he was able to sit in it for 20 minutes, 30 minutes, etc. He was sitting within a couple mths.
Qadoshyah
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sister to 10 siblings including boy(DS)/girl
twins - February 2005 
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