An incubator comprising a mattress tray and a plurality of baby guards surrounding a vicinity of an outer periphery of the mattress tray, wherein: a first baby guard from out of the plurality of baby guards includes a grommet； the first baby guard is detachably attached to a first attachment location installed at a vicinity of the outer periphery of the mattress tray； a second baby guard from out of the plurality of baby guards is detachably attached to a second attachment location installed at a vicinity of the outer periphery of the mattress tray； and the first baby guard is detachable from the first attachment location and attachable to the second attachment location, and the second baby guard is detachable from the second attachment location and attachable to the first attachment location.
