Convertible carseats

Hi all, I have the Nuna Rava for my first child, and I was thinking of the Clek Foonf for baby #2, but we subscribe to Consumer Reports and the Clek is really poorly rated! I’m sad because I read so many good things and had my heart set on the Merino wool version because I’m paranoid about flame retardants. Does anyone else know of any good car seats without flame retardants? If not I guess we’ll just buy another Rava🤷🏼‍♀️