disclosed is a medical bed comprising : a bed plate on which a patient is laid in a desired posture ; and a device for retaining the patient in the desired posture in such a manner that the patient is prevented from moving along the bed plate . the retaining device comprises : a plurality of elongated members for blocking motion of the patient along the bed plate ; and a plurality of recessed of the bed plate or suction pad equipped to each elongated member for adjustably fitting the elongated members to the bed plate to adapt the elongated members for the desired posture of the patient . the medical bed with the retaining device is suitable for medical treatment of patients , and in particular , for treatment of infant patients .