He is so heavy he often stops breathing whilesleeping - leaving his terrified parents fearing thatone day he may not wake up.
Doting dad Manoel Abreu, 38, said: "Everything ishard for him - he is a baby carrying an adult's weight. His heart must be suffocated andworking under a lot of pressure. If he doesn't get the treatment he requires there is a verygood chance he will pass away."
Misael, from Espirito Santo, Brazil, was born a healthy 6lb 6oz, but immediately started pilingon the pounds. Doctors believe he may be suffering from Prader-Willi syndrome, a raregenetic condition that leaves him with an insatiable appetite.
He now weighs a hefty 178lb and is still gaining despite following a low-fat diet and walking for40 minutes each day.
Mum, Josiane de Jesus Caldogno Abreu, 37, said: "He has been putting on a lot of weight sincehe was a baby - even when I was breastfeeding him it was more than expected. But it was onlywhen he was one and a half years old that we began to worry. He was gaining 3kg (6.6lb) amonth and was starting to get very heavy."
"His situation is complicated. We know we could lose him at anytime. Sometimes when he issleeping I watch him to see if he is breathing. I cry a lot because we want to help him. But I amalso very proud of him because he is a child who doesn't surrender."
Misael visits a doctor every three months to try and control his condition but currently there isno cure for Prader-Willi syndrome.
Paediatric neurologist Lucio Coelho Miranda said: "Every appointment we have had he has puton a lot of weight - sometimes up to 5kg (11lb). I think Misael could get help from someoneoutside of Brazil - both medically and financially - so he can get the laboratory and genetictesting he needs."