Abstract: A collapsible baby stroller has a non-collapsible base frame with wheels. A seat, a handlebar, and a chest bar are supported on the base frame. A plurality of joints are provided for collapsing the baby stroller above the base frame. The base frame has an outer boundary as seen in a plan view, and the handlebar, the armrests, the seat, and the chest bar, when the stroller is folded, do not protrude substantially past the outer boundary of the base frame.