BAGHDAD  At least 80 people died and 120 others were injured Thursday in three bombings, one by a female suicide bomber in Baghdad who, Iraqi officials said, held a young child’s hand as she set off her explosives among a group of women and children receiving emergency food aid.

The second suicide bombing struck a restaurant filled with Iranian tourists in a restive city north of the capital.

The number of people killed in the attacks is the largest single-day total since February 2008.

The overall level of violence in Iraq is at its lowest since the American invasion in 2003, and Iraqis have been venturing out to parks, restaurants and nightclubs. But a string of recent attacks, highly organized and carried out under tight security, has raised worries that Baathist and jihadi militants are regrouping into a smaller but still lethal insurgency seeking to reassert itself as the American troop presence on the ground is reduced before a full withdrawal in 2011.

“The government was treating the situation like they’d won a victory,” said Sheik Jalal al-Din Saghir, a member of Parliament from the Islamic Supreme Council of Iraq, a Shiite political party. “They relaxed. We can’t ignore that there were security successes, but that doesn’t mean the story is finished.”