Lina Medina is the world's youngest mum. She gave birth to her first son Gerardo in May 1939 at the age of five.

After detailed studies by Doctor Lozada, it is found that Lina started her period when she was only eight months old, and she had already developed breasts and pubic hair when she was four year old. Both Lina and her son were healthy after the Caesarean birth. It is not known who the father is.