###HUMAN: what is the monthly maximum of the weight of patient 012-58944 during the first hospital visit?, ###ASSISTANT: SELECT MAX(patient.admissionweight) FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '012-58944' AND NOT patient.hospitaldischargetime IS NULL ORDER BY patient.hospitaladmittime LIMIT 1) AND NOT patient.admissionweight IS NULL GROUP BY STRFTIME('%y-%m', patient.unitadmittime)