The child's genitals were growing abnormally big, while the rest of his body was small compared to other children the same age.
"My mother-in-law, who has taken care of several children in the family, also said that his growth seemed unnatural. That is when we took him to the doctor," said his mother.
Vaibhav's doctor, Vaishakhi Rustagi, told the Hindustan Times, "Precocious puberty is traumatic for a child of his age and it makes them violent - his muscle strength increased to a level that even his parents couldn't control him."
Another danger of the condition is that a child can stop growing prematurely, and remain around 3-4ft tall for life, although Vaibhav is now on medication to relieve his symptoms.
One of the earliest cases of the condition occurred in Peru in 1939, when Lina Medina gave birth at just five years and seven months old, making her the youngest mother in history.