A stroller with a front tray in front of the seat that can be folded down. The front tray is attached to two side bars of the stroller and can rotate around an axis that is horizontal and perpendicular to the moving direction of the stroller. The rotation axis is along a substantially straight side of the tray. When the tray is folded down, the tray is substantially vertical with the straight side at the top, and an infant car sear can be placed on the stroller such that the vertical tray is inserted into a notch in the base of the car seat.