TOKYO: A baby born in Tokyo weighing the same as a large onion (just 268 grams)  has gone home healthy, become the smallest newborn boy in the world to leave hospital safely.

The  smallest bay baby boy weighing just 268 grams at birth has  decleased smallest surviving male baby in the world by Japan’s Keio University Hospital on Wednesday. The boy, born through Caesarean-section last August, was sent home on February 20 after months of intensive care in a Tokyo hospital.

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Keio University Hospital said, after he stopped growing in the womb. He was so small he fit in an adult's cupped hands.  But after five months of treatment, he now weighs 3.238 kilos, is feeding normally, and has been discharged.

 Dr. Takeshi Arimitsu said, “I want people to know that babies can return home vigorous even if they are born small.’

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Doctors feared the baby’s life was in danger after he failed to gain weight during pregnancy. He was kept in intensive care until his weight reached 3.2 kilograms, Dr Takeshi Arimitsu of the university’s School of Medicine, Department of Paediatrics, told the news agency.

Earlier, The previous record for the world’s smallest baby was held by a German baby boy in 2009. The baby boy weighed just 274 grams. The world’s smallest girl, weighing 252 grams, was also born in Germany.