From www.britaxusa.com under "customer support" then FAQ's" then "Roundabout"
Q. What is the weight capacity for the Roundabout child restraint?
A. Refer to the owner's manual and labels located on the child restraint. Current production is certified up to 33 lbs. rear facing and 40 lbs. forward facing. Older restraints were certified up to 30 lbs. rear facing and 40 lbs. forward facing.
Q. Previously I was advised I could use my older Roundabout rear facing up to 33 lbs. and no standing height requirement. Why is Britax now saying I cannot?
A. Britax continuously tests and reviews products, as well as our frequently asked questions. Based on continuous improvement reviews, Britax Child Safety has determined rear facing weight capacity and height limitations should be followed as recommended per the manual supplied and labels affixed to the individual restraint. We apologize for any inconvenience this may have caused.
Q. What is the weight capacity for the Roundabout child restraint?
A. Refer to the owner's manual and labels located on the child restraint. Current production is certified up to 33 lbs. rear facing and 40 lbs. forward facing. Older restraints were certified up to 30 lbs. rear facing and 40 lbs. forward facing.
Q. Previously I was advised I could use my older Roundabout rear facing up to 33 lbs. and no standing height requirement. Why is Britax now saying I cannot?
A. Britax continuously tests and reviews products, as well as our frequently asked questions. Based on continuous improvement reviews, Britax Child Safety has determined rear facing weight capacity and height limitations should be followed as recommended per the manual supplied and labels affixed to the individual restraint. We apologize for any inconvenience this may have caused.