Authorities were called to attend to the victim who had been severely injured in the explosion, meant to reveal the gender of the baby to party guests, Fox News and AP reports.
A statement from Sandholdt said that the family had gotten together for what should have been a happy event.
The Marion County Sheriff's Office told KCCI-8 that officials responded to the explosion at 4:03 p.m.at 180th Place in rural Knoxville, which is about 40 miles southeast of Des Moines. She was struck in the head by a piece of metal from 45 feet away and died instantly.
The incident remains under investigation.
They say family members used gunpowder to create a homemade stand that was supposed to blow colorful powder indicating the child's sex, but tape over the top of the metal tubing inadvertently created a pipe bomb that sent shrapnel flying. Rather, it is common for expectant parents to use color-coded cakes, balloons, or confetti as the gender-reveal mechanism.
The state fire marshal and the Bureau of Alcohol, Tobacco and Firearms are investigating, the sheriff's office said.
Gender-reveal parties do not typically feature explosives. A 2017 gender reveal in Arizona sparked a wildfire that burned 47,000 acres, while a July shindig in Australia ended prematurely when a vehicle outfitted to belch blue smoke erupted in flames, forcing the driver and guests to flee.
"This is a reminder that any time someone mixes these things there is a high potential for serious injury or death".