Milagros Cerron, whose name means "miracles" in Spanish, was born with a rare congenital defect known as sirenomelia, or "mermaid syndrome," which occurs in one out of every 70,000 births.
On June of 2005, doctors began the first of three complicated operations to separate the two-year-olds legs, which were seamlessly fused all the way to her heels.
A medical team of 10 doctors, including plastic surgeons, paediatricians and heart specialists, assisted in the surgery.
Her doctor, Luis Rubio said that his team had "reached 98 percent" of their goal and the rest would be mostly cosmetic surgery to make Milagros look "as a normal person".
Her father, Ricardo Cerron, said that he hoped "with faith in God" that Milagros would be able to walk and have a normal life.
"I hope we could go for a walk, that she could go to school, and do it by herself. That's what I would like," said Mr Cerron.
There are only three known cases of children with the affliction alive in the world today.