My very big 3.5 year old has outgrown the Cosco Scenara we use in our second car. She's also nearing the height limit, forward-facing, on her Britax Marathon. (We turned her a few months ago after realizing that she was several pounds over the rear-facing limit. Oops!) Thoughts on where we should go from here? To be perfectly honest, I don't even know what's "supposed" to happen next. One final thought- we are currently TTCing number two, so I'm open to something that DD can use for a few years, that could then be used for the new baby. And, DD is very tall- close to 40 inches.