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Do only Graco car seats fit with this frame stroller or do other brands work with it too?Which car seat did you have with this frame?
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I don't know because my friend had graco car seat with that frame but I think other brands should fit too.You can ask babies "R"us sales person they help you on these issues.
About the car seat I bought up to 20 pounds for both of my children.:) Because (that's my personal view) first it is heavy and second when I saw those convertible ones its quality was not that good.But then again it was my personal opinion. :)