The stroller fits with one universal car seat adapter on the front seat. (ultimatestrollerguide.com)
With their standard universal car seat adapter, it functions as a travel system with most infant carrier car seats. (havebabywilltravel.com)
If you own a different brand of car seat, there is also the Britax universal car seat adapter, which will let you use infant car seats from Graco, Peg Perego, and Chicco in the same way. (momtricks.com)