A woman born in 1984 through in vitro fertilization delivered a baby boy in 2003 after conceiving naturally in what is believed to be a first for Japan, a doctor said Sunday.

The boy's birth and steady growth indicate that the assisted reproduction technology had no negative impact on the woman born through in vitro fertilization, said Masakuni Suzuki, a Tohoku University professor emeritus who assisted at the woman's birth.

The woman, the third person born in Japan through in vitro fertilization, was 19 when she delivered the 2,726-gram boy in August 2003 at a clinic in the Tohoku region, said Suzuki, who now runs Suzuki Memorial Hospital in Miyagi Prefecture.