Use of broad-spectrum antibiotics.
D000667:Ampicillin / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D003023:Cloxacillin / Q000627:therapeutic use; D006801:Humans; D007231:Infant, Newborn; D010403:Penicillin Resistance
D000900:Anti-Bacterial Agents; D000667:Ampicillin; D003023:Cloxacillin