SARAJEVO, Bosnia-Herzegovina (AP) _ A 29-year-old first-time mother gave birth to a baby boy at two minutes after midnight Tuesday, making him the designated six billionth baby, the head of a pediatric clinic said.

The United Nations estimated that the world's population would reach six billion Tuesday, and the first child born here was to be designated as the symbolic Baby Six Billion.

Dr. Idris Bukvic, pediatrics chief at Sarajevo's hospital, said Fatima Nevic gave birth to the 8-pound, heathy boy after a seven-hour labor. Mother and baby were fine, he said.

``This is an extraordinary event to our great pleasure,'' Bukvic said.

The United Nations had hoped to keep the baby's identity secret until Tuesday afternoon, when Secretary-General Kofi Annan plans to visit mother and child.

Mrs. Nevic and her husband, Jasminko, are from the Bosnian town of Visoko.