The attacks come as IS militants are steadily losing more territory to US-backed Iraqi forces in the battle for Mosul, the country's second-largest city. The Sunni extremists are increasingly turning to insurgency-style terror attacks to detract from their losses.
The nighttime attack outside the ice cream parlour in the bustling Karrada neighbourhood killed 17 people and also wounded 32, police and health officials said.
Other videos of the attack posted on social media show wounded and bloodied people crying for help on the sidewalk outside the ice cream parlour.
In the second attack, an explosives-laden car went off during rush hour near the state-run Public Pension Office in Baghdad's busy Shawaka area, killing 14, a police officer said. At least 37 people were wounded in that attack, he added.
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In separate online statements, IS claimed responsibility for the two attacks, saying its suicide bombers targeted gatherings of Shiites. The Associated Press could not verify the authenticity of the statements but they were posted on a militant website commonly used by extremists.
The attacks came just days into the holy month of Ramadan when Muslims fast during daylight hours. After sundown, families break their fast and Baghdad's restaurants and cafes quickly fill up with people staying up long into the night.
During Ramadan last year, another section of Karrada was hit by massive suicide bombing that killed almost 300 people, the deadliest single attack in the Iraqi capital in 13 years of war. The attack was also claimed by IS.
In the northern city of Mosul, Iraqi troops are pushing IS fighters out of their last strongholds. Iraqi commanders say the offensive, which recently entered its eight month, will mark the end of the IS caliphate in Iraq, but concede the group will likely increase insurgent attacks in the wake of military defeats.