a baby carriage includes a frame and a seat mounted onto the frame . the frame includes a support rack and a pair of handle sets coupled on the support rack . the handle sets have respectively an elevation set and a folding set connected through a flexible member . the elevation set can adjust the height of a handgrip located at the upper end of the handle set . the folding set has an elastic pin and is inserted into the support rack . through a driving member located on the upper end of the handle set , the latching state between elastic pin and the support rack can be released to rapidly fold and retract the frame . usability is therefore improved and the folded size can also be reduced .