I'm not sure if this would work. The dimensions say 14.7x14.4 but it looks pretty small. I'm not sure how accurate the measurements are on the BRU website. You might want to check it out in person.
http://www.toysrus.com/product/index...entPage=family
This one might work, and you could probably use it with out the crotch piece and buckles:
http://www.toysrus.com/product/index...entPage=family
This one also looks small but there are no dimensions, even on the Safety 1st website, so you may need to look at it in-store:
http://www.diapers.com/p/safety-1st-...r-green-805520
Mom to a spirited, red-headed, former 28-weeker 10/2009 and a more mellow monkey 12/2013.