See Photos: Meet 3 Yr Old Boy Who Weighs 70kg

 The boy, known only as Misael, was born a healthy 6lb 6oz (2.9kg). 
But every month since then, he has gained 6lb - causing him to balloon in size and leaving him struggling to walk. He now weighs 154lb, or 70kg, his parents say.

 Doctors now believe he may be suffering from Prader–Willi syndrome, a rare genetic condition characterised by a constant hunger and desire to eat.
Children with the condition will eat three to six times more than others of the same age - and even then will probably still feel hungry. 
He also suffers from an underactive thyroid - which can cause weight gain - and his parents say medication to help treat this is not helping.
More photos after the cut.