An adjustable baby crib, comprising: - a frame; - an enclosing element, which is attached to the frame and is configured to receive a baby, wherein: - the enclosing element comprises a bottom wall and side walls, - the side walls extend between a top edge attached to the frame and a bottom edge connected to the bottom wall, to thereby delimit, with the bottom wall, a cavity configured to receive a baby, - the top edge of the side walls defines an opening of the cavity and is spaced from the bottom wall in a longitudinal direction (X-X), - the frame comprises an upper portion, attached to the top edge of the side walls for supporting the enclosing element, and support members, configured to rest on the ground and fixed to the upper portion of the frame to support the upper portion of the frame, - the side walls comprise at least one portion made of a flexible material, and - the crib comprises a zipper, which is associated with the side walls and is configured to be manually actuated to switch the crib between a first configuration and a second configuration, wherein the distance in the longitudinal direction (X-X) between the bottom wall and the top edge of the side walls in the first configuration is smaller than the distance in the longitudinal direction (X-X) between the bottom wall and the top edge of the side walls in the second configuration, the zipper extending around the side walls, on the exterior thereof, - the upper portion of the frame comprises two tubular members, which are rotatably joined together by means of two junction elements for collapsing the crib, characterized in that: - in the first configuration the side walls support the bottom wall, and - the support members are removable from the upper portion of the frame for collapsing the crib. - a frame; - an enclosing element, which is attached to the frame and is configured to receive a baby, - the enclosing element comprises a bottom wall and side walls, - the side walls extend between a top edge attached to the frame and a bottom edge connected to the bottom wall, to thereby delimit, with the bottom wall, a cavity configured to receive a baby, - the top edge of the side walls defines an opening of the cavity and is spaced from the bottom wall in a longitudinal direction (X-X), - the frame comprises an upper portion, attached to the top edge of the side walls for supporting the enclosing element, and support members, configured to rest on the ground and fixed to the upper portion of the frame to support the upper portion of the frame, - the side walls comprise at least one portion made of a flexible material, and - the crib comprises a zipper, which is associated with the side walls and is configured to be manually actuated to switch the crib between a first configuration and a second configuration, wherein the distance in the longitudinal direction (X-X) between the bottom wall and the top edge of the side walls in the first configuration is smaller than the distance in the longitudinal direction (X-X) between the bottom wall and the top edge of the side walls in the second configuration, the zipper extending around the side walls, on the exterior thereof, - the upper portion of the frame comprises two tubular members, which are rotatably joined together by means of two junction elements for collapsing the crib, - in the first configuration the side walls support the bottom wall, and - the support members are removable from the upper portion of the frame for collapsing the crib.