Susanna Adams died in Boston on February 4, 1770, at thirteen months of age. She was John and Abigail Adams's second daughter, born on December 28, 1768, and did not live to experience the Revolution or her father's presidency. Family chronology securely identifies the child and her short lifespan, but the consulted material does not establish a medical cause or describe a continuous final illness. Her mother's later death from typhoid fever in 1818 concerns a different person and cannot be used as Susanna's diagnosis. She is also distinct from her grandmother Susanna Boylston Adams and from later Adams granddaughters who bore the same name. No reliable account of the child's symptoms, treatment, final attendants, or burial-day events has been established here. Her death is therefore recorded as the loss of a very young child, without assigning a disease from family history or inventing her final hours.