Foldable bed for infants

A foldable bed comprising an upper frame including four first bars each having a first joint provided in a middle portion and having end portions coupled together by four second joints, a lower frame including four beams each having a third joint provided in a middle portion and having end portions coupled together by four fourth joints, four posts coupled between said second joints and said fourth joints, each of said posts including at least two holes formed therein, a block slidably engaged on each of said posts, a coupler, four rods each having a first end coupled together at said coupler and having a second end coupled to a respective block, a room formed in a middle portion of each of said blocks, a disc slidably received in each of said rooms, a shaft extended through each of said discs and having a first end engagable with said holes of said posts and having a second end extended toward said rods, means for biasing said shafts to engage with said holes of said posts, said coupler including a depression formed in a middle portion thereof, a knob including a spindle rotatably received in said depression of said coupler, and four cables each having a first end coupled to a respective shaft and a second end coupled to said spindle, said shafts being pulled and disengaged from said holes of said posts when said knob is rotated and when said cables are wound on said spindle, and said shafts being biased to engage with said holes by said biasing means when said knob is released, whereby, said blocks are allowed to adjust upward and downward along said posts.