S.S.
We just bought our 9 month old twins...the "Safety 1st 5 Recline and Grow 5 Stage Booster Seat" from Babies R Us for at home use and on the go. We love it!!! And the girls have more range of motion in reaching their food than a traditional highchair. I like that it is secure to the chair that we place it on...it has a back strap and a bottom strap. The tray fits snug on the seat and has three diff positions it can be in, depending on how big your child is. We have it on #3 at the moment because our girls are so tiny, and it fits them really securely! We could not be happier with all the adjustments it has...something we can use for years to come! We have even taken it with us to eat at restaurants...like Fudruckers and it works great there.
http://www.toysrus.com/product/index.jsp?productId=3312379