Baby crib comprising: - an enclosure having side walls made of a flexible material and defining a space configured to receive a baby, the enclosure also having a bottom wall made of a flexible material, said side walls having top portions delimiting a top opening of the enclosure ; - an upper frame configured to be attached to said enclosure , - a lower frame configured to support said bottom wall , said upper frame being spaced apart from said lower frame along a longitudinal direction (X-X), - support members attached to said upper frame and said lower frame , said support members being configured to rest on a ground surface and being spaced apart along a transverse direction (Y-Y) perpendicular to said longitudinal direction (X-X), wherein - said upper frame comprises a first part firmly attached to said support members and a second part , said first part being attached to a first top portion of the first side wall of the enclosure , said second part being attached to a second top portion of the second side wall of the enclosure , - said second part is pivotally coupled with said support members to move reversibly from a first position to a second position to move said second part relative to said first part ; characterized in that : - in the first position, a first distance (D1) is defined and measured along the longitudinal direction (X-X) between the second top portion and the bottom wall , - in the second position, a second distance (D2) is defined and measured along the longitudinal direction (X-X) between the second top portion and the bottom wall , - said second distance (D2) is smaller than said first distance (D1). - an enclosure having side walls made of a flexible material and defining a space configured to receive a baby, the enclosure also having a bottom wall made of a flexible material, said side walls having top portions delimiting a top opening of the enclosure ; - an upper frame configured to be attached to said enclosure , - a lower frame configured to support said bottom wall , said upper frame being spaced apart from said lower frame along a longitudinal direction (X-X), - support members attached to said upper frame and said lower frame , said support members being configured to rest on a ground surface and being spaced apart along a transverse direction (Y-Y) perpendicular to said longitudinal direction (X-X), - said upper frame comprises a first part firmly attached to said support members and a second part , said first part being attached to a first top portion of the first side wall of the enclosure , said second part being attached to a second top portion of the second side wall of the enclosure , - said second part is pivotally coupled with said support members to move reversibly from a first position to a second position to move said second part relative to said first part ; - in the first position, a first distance (D1) is defined and measured along the longitudinal direction (X-X) between the second top portion and the bottom wall , - in the second position, a second distance (D2) is defined and measured along the longitudinal direction (X-X) between the second top portion and the bottom wall , - said second distance (D2) is smaller than said first distance (D1). <EOS>