6个月一下baby不能直接用这个stroller,说明书上应该写了的。你应该买一个adapter装在stroller上,然后b2infant car seat放在adapter上就可以推车了。我当时用的是chicco的infant car seat, thus ordered one adapter that is compatible with chicco. check this link below:
http://babyjogger.com/c-31-Accessories.aspx