The infant, whose official birthweight was 9.45 ounces, takes over the smallest surviving baby boy record that was previously held by a child in Germany who was born in 2009 weighing just 9.6 ounces.
The baby, the first son of parents living in Tokyo, was delivered via cesarean section on August 28 when the mother was in her 24th week of pregnancy. When he was finally released from Tokyo's Keio University Hospital, two months after his due date, he had grown to a weight of 3.2kg, and is now feeding normally.
In Tokyo, Keio University Hospital quoted the boy's mother as saying, "Honestly speaking, I didn't know whether he could live, so I am really happy he has grown so much".
There had been 23 babies worldwide who survived after having been born prematurely and weighing under 300 grams, out of whom only four were boys, according to the Tiniest Babies Registry website.
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The survival rate of the smallest babies is substantially lower for boys compared to girls. The reason is not known, although one theory is that male babies lungs develop more slowly.
Dr. Kristin Atkins, a specialist in maternal and fetal medicine at the University of Maryland School of Medicine explained to ScienceLive that like very small babies, large babies aren't always healthier.
The baby was initially so small he could fit in both hands, the hospital said, but grew steadily and was eventually able to breastfeed. Doctors said the preterm birth was necessary after they found that the baby was not gaining weight and his life was at risk.
According to Guinness World Records, the boy was born in the city of Aversa, Italy, in September 1955.