Doctors are trying to find out why an 11-month-old Colombian baby is already the weight of an average eight-year-old.
At just 11 months old, the baby weighs nearly over 61 pounds.
The child's mother, Milena Orosco de Agudelo, said her son's unusual growth spurt began when he was just two months old.
He has had several medical examinations carried out which suggest he may have a problem with his endocrine system.
"He had some tests done and the results show that he has a thyroid malfunction. Then, he had a cardiogram test done and that test shows that he has the bones of an eight-year-old boy, but they have not told me where that came from," Telegraph quoted Miss Orosco de Agudelo, as saying.
Doctor David Dias, of the Barranquilla Pediatric Hospital, said more examinations need to be carried out to discover why the child has become so large.
He said: "The baby will have tests done to see if he's obese or we're dealing with hyperthyroidism."
Hypothyroidism is often a result of an autoimmune condition known as Hashimoto's thyroiditis, in which the body's own immune cells attack and destroy the thyroid gland.
Symptoms include fatigue and weight gain.