Join Date: Feb 2009
Location: slowly making a way home
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Your DD has already outgrown the Scenera, so it would not be a safe option for her. Not even for one short ride.
Many 4 year olds are not ready for boosters. Will she sit properly in it all the time, every time? No leaning forward or backward, no slouching? Boosters aren't always narrower than car seats, as you need additional space for buckling and unbuckling.
If she needs another harnessed seat, the Evenflo Maestro is a relatively inexpensive FF seat ($75) that is narrow and light weight.
Are any of the kids RF? It's always easier to have a RF seat or two in a 3-across situation.