Chicco ketfit 30

Hello ladies , I just had a baby in July and he was in the NICU for 41 days . I bought the chicco keyfit 30 because it had to be a car seat up to 4lbs . I didn’t get a stroller because I also have a daughter who will be 2 in December . I need a double stroller but idk which one the chicco ketfit 30 can fit into does have to be a chicco or can it be anyone . Thanks