British woman gives birth to biggest baby born naturally in Spain Ms Marin, who lives in Spain with her partner who is from Colombia, said she knew the baby would be big "but not that big," the statement said. The hospital said the baby is the "biggest baby ever born in Spain through natural childbirth." In my 40-year professional career I have never known of any case of a birth with this weight by natural childbirth. We are all very satisfied with the work which we carried out," the head of the hospital's department of obstetrics and gynaecology, Javier Rius, said in the statement.