Kailee Hundley ended up dying in a car seat after she'd been sucking on a bottle loudly and crying.

The 13-month-old's slurping of soy milk bothered Jessica Cummings' sister, Tiffanie Williams. Williams was trying to sleep after working late at a restaurant, then going to her boyfriend's house.

It was also disturbing napping infants in other parts of the house where Cummings ran a day care for six months.

Cummings partially strapped Kailee in a car seat, and the toddler strangled on a strap while being unsupervised for 2 ½ hours.

Now, Cummings faces more than 2 ½ years in prison after a jury found her guilty of involuntary manslaughter Wednesday in Sedgwick County District Court.

Cummings, 27, sobbed after hearing the verdict, which followed about five hours of deliberations. Kailee's family members also dabbed tears from their eyes.

"Hopefully, if any good comes out of this, it will get people to realize the risks to children by leaving them unattended in a car seat," Assistant District Attorney Shannon Wilson said afterward.

To find Cummings guilty of the toddler's accidental death, jurors had to find that she deliberately put Kailee in danger by strapping her in the car seat March 25.

"In an extremely difficult case, they followed the law," Wilson said of the verdict.

Testifying in her defense, Cummings insisted she hadn't meant any harm to Kailee.

But Wednesday under cross-examination, Cummings also said she knew what was expected of her as a licensed day care provider, including regulations that a child under 18 months should sleep in a crib or a playpen.

"Not a car seat, not an infant carrier, not a stroller attachment," Wilson told the jury in her closing arguments.

John Stang, Cummings' lawyer, said in her defense that she could not have foreseen that Kailee faced any danger as she napped in a car seat, something numerous children have done on long trips.

Stang pointed at a diagram of the house near 13th and Woodlawn, showing how close the kitchen was to where Kailee rested.

"She was, what, 8 feet away?" Stang said.

He said Cummings could not have foreseen risks to Kailee's life. Even Deborah Johnson, the coroner who performed the autopsy, testified she had never seen a case like this, Stang said.

"But what did Dr. Johnson also say?" Wilson argued to the jury. "She said in no uncertain terms -- never leave a child unattended in a car seat."

Kailee also was improperly buckled into the seat, Johnson determined, allowing the girl to slip down and strangle on the strap.

Cummings, who is seven months pregnant, remains free on bond awaiting her sentencing, set for Jan. 30 before Judge Joseph Bribiesca.