A system to transport infant children is provided. The system comprises a chassis having a frame; a pair of rear legs pivotally coupled to the frame at a rear leg pivoting axis; and a pair of front legs, each front leg pivotally coupled to a respective rear leg at a front leg pivoting axis, wherein the rear legs and the front legs are retracted and proximate the frame in a first transport condition, and wherein the rear legs and the front legs are deployable away from the frame to a second transport condition. The system may also comprise an infant car seat coupled to the chassis.

A convertible infant car seat and stroller assembly is provided, comprising: an infant car seat shell; and a chassis coupled to the infant car seat, comprising: a frame; a pair of rear legs pivotally coupled to the frame; and a pair of front legs, each front leg pivotally coupled to a respective rear leg, wherein the rear legs and the front legs are retracted and proximate the frame in a first transport condition usable as in infant car seat, and wherein the rear legs and the front legs are deployable away from the frame to a second transport condition usable as a stroller; wherein, in the second transport condition, the front legs and the rear legs are releasably secured to the chassis frame in the deployed position to prevent the front legs and the rear legs from pivoting.