In a shocking incident, a one-year-old child from China underwent a startling surgery in which doctors extracted an undeveloped twin from the infant's brain. The case was documented in a report published in the Neurology journal. According to the sources, doctors discovered the "unborn twin" through scans when the child was brought in with an enlarged head and motor skill difficulties. According to the study, the twin had developed upper limbs, bones, and finger-like buds. Genome sequencing of the twin confirmed that it was, indeed, the infant's twin, a condition known as foetus-in-fetu. This rare medical occurrence happens when a mass of tissue similar to a foetus forms inside the body of the living twin. Such cases are extremely uncommon, affecting only one in a million babies worldwide.