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The original KeyFit (22 lbs.), KeyFit 30, and KeyFit 35 car seats are compatible with the KeyFit Max base. This implies that you can upgrade if you already have one of these models by just buying a KeyFit Max base. However, a KeyFit 30 base cannot be used with a KeyFit 35 seat. Furthermore, the Chicco Fit2 Infant & Toddler seat is incompatible with the KeyFit Max base. https://carseathaven.com
