The Bugaboo Frog's design starts with a strong, yet lightweight aluminum chassis. A reversible three-position seat, for children up to 40 pounds, and material to convert the seat to a bassinet for newborns to six months old, or up to 19 pounds, is included and can be attached to the base. For safety, a five-point safety harness system is built into the seat. For added convenience, with special car seat connectors, the Graco SnugRide, or Peg Perego Primo Viaggio infant car seats can also be attached directly to the Bugaboo Frog's base.