A few months back, Britax added a new member to the tried and true Roundabout family, the Britax Roundabout 50. It’s essentially the same seat from a feature standpoint as the original Roundabout, only slightly taller with a 50lb weight limit. As cars become smaller, this new seat is a welcome addition to the Britax convertible line. In an ideal word, all parents would buy the larger 60lb limit seats, as they will take a child all the way through to a booster seat. However the reality is that unless you have a larger car, minivan or SUV, they just don’t fit, especially when they are backwards facing. The result is that people opt for the 40lb limit which kids realistically outgrow in height before weight at around age 3, which is too early to move them to a traditional belt booster.
The extra height in the Roundabout 50 should take you until about 4-5 years old, saving the need to purchase another in-between car seat or five point harness booster. I have swapped out our new Roundabout 50 for the Diplomat in my car because I need it to fit both my 4 year old and 18 month old interchangeably and it’s a much better option to bridge that gap. It also fits well in the back seat of a mid size sedan.
See the detailed Britax Roundabout Review