The 3-year-old boy who weighs 150lb due to syndrome - PHOTO

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.Misael's father Michael said: 'Even taking him to the doctor or leaving the house with him is difficult. 'And when we walk down the street, people stop, want to take pictures with him, people say that they never saw [a boy] this size, people want to know how old he is, how much he weighs...'Transporting Misael - who has behavioural problems - is so problematic that his family, from Cachoeiro de Itapemirim, Espirito Santo, are forced to hire a private taxi. His mother said: 'The doctors think he might have this syndrome that makes him gain weight. They want to do tests.(dailymail.co.uk)Bakudaily.Az