Munchausen Syndrome by Proxy (the fabrication of illness by a mother in her child) is often a serious form of child abuse that has been recognized increasingly over recent years. Approximately one-half of the mothers in this study had either smothered or poisoned their child as part of their fabrications. Lifetime psychiatric histories are reported for 47 of the mothers. Thirty-four had a history of a Factitious or Somatoform disorder, 26 a history of self harm, and 10 of alcohol or drug misuse. Nine mothers had a forensic history independent of convictions related to child abuse. Nineteen of these mothers were interviewed from 1–15 years after the original fabrications. The most notable psychopathology was the presence of a personality disorder in 17 of the mothers, which were predominantly Histrionic and Borderline types. Most subjects, however, met the criteria for more than one category of personality disorder.