kdines -- I wouldn't put a 2 yr old in a high back booster seat! I would buy a seat that can be both a 5pt harness AND a high back booster. (That may be what you are talking about). If it is a high back booster ONLY, I advise against it. Keep that 2 yr old in a 5 pt harness!!
The type of seats are confusing.
You have the following: - an infant carrier (usually only good up to 20-22 lbs, but some of the newer models are up to 30lbs; is rear facing ONLY)
- a convertible car seat w/o the booster option (this seat can be rear facing OR forward facing depending on the needs of your child; but once your child outgrows the harness, it can NOT be turned into a booster seat)
- a convertible car seat w/ the booster option (same as one above; except when your child outgrows the harness, it CAN be turned into a booster seat)
- a forward facing carseat usually w/ booster option (this seat can ONLY be forward facing and when your child outgrows the harness, can USUALLY be turned into a booster seat)
- a high back booster (this is ONLY a booster seat... has a back to it in order to provide head protection for your child... must be used with a shoulder-lap belt)
- a backless booster (this is ONLY a booster seat -- no back on it -- must be used with shoulder-lap belt)
Basically, any seat can be put in one of the above categories.
Here are some good sites for information regarding carseats: Car Seat Basics - Selection and Use U.S. Department of Transportation - NHTSA - One Minute Safety Seat Checklist - DOT HS 809 231 - May 2002
Great site by NHTSA rating the ease of each carseat's use (done in 2007) 2007 Child Safety Seat Ease of Use Ratings  |