A family from Tokyo, Japan is breathing a major sigh of relief after their baby son was finally able to leave the hospital months after he was born prematurely in August.

The baby boy, who has not been named publicly, was born at just 9.45 ounces, making him the smallest surviving baby boy on record.

The baby was born prematurely because his mother had to undergo an emergency c-section 24 weeks into her pregnancy after doctors found that the baby was not gaining weight in the womb, and the only way to save the baby’s life was to deliver him prematurely.

Though experts say that babies born at less than 2.2 pounds have just a 39% chance of survival, doctors at the Keio University Hospital, where the boy was treated, gave a more optimistic 50% survival rate.

The boy gained seven pounds during his time at the hospital, and he was discharged last week as a healthy infant.

“I can only say I’m happy that he has grown this big,” the boy’s unnamed mother said. “Because honestly, I wasn’t sure he could survive.”

The previous record for smallest surviving baby boy was held by a German preemie who weighed just 9.6 ounces when he was born in 2009. The record for smallest surviving baby girl is currently held by a German baby girl who was born prematurely at just 8.8 ounces in 2015.

Doctors all over the world are happy about this Japanese baby’s survival, as it will give hope to other parents of small premature children. His survival is particularly comforting because boys born prematurely have a lower survival rate than girls in premature births, as their lungs seem to develop more slowly.

We wish this little boy the best of luck in the years to come!