In the incident, the infant "hit its head on the footstool and then the child started crying", District Attorney Wade Newell said, according to WEAU.
Police told the Star Tribune that four children and an adult had been questioned and they all pointed the finger at the 10-year-old girl.
The grandmother of one of three Girl Scouts killed in a Wisconsin hit-and-run crash says the child dreamed of being an animator and shared a love of crafts with her mom, who also died in the accident.
A 10-year-old girl has been taken into custody over the murder of a six-month-old baby.
Last night, the girl was led into court in handcuffs and sobbed all the way through a hearing. Judy Schneider said her 6-year-old grandson doesn't understand that they're gone.
This photo provided by the Chippewa County Sheriff's Office in Wisconsin shows Colten Treu, who is accused of striking and killing three Girl Scouts and a parent and critically injuring a fourth girl near Chippewa Falls, Wis., Nov. 3, 2018.
Two small groups of Girl Scouts and their adult chaperones wore bright green safety vests Saturday as they walked along both sides of County Highway P, which they had adopted as a community service project.
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After Saturday's fatal wreck, Treu went home and had someone else park the vehicle in the garage, the complaint says.
The hit-and-run suspect later admitted to law enforcement that he had been huffing chemicals before the deadly crash.
Neither the girl or the infant were identified in media reports.
Treu was arrested on charges including four counts of homicide by negligent use of a motor vehicle, police said. The driver, Colten Treu, sped away, but later surrendered to authorities.
Judy Schneider, the mother of Sara Jo Schneider and Haylee's grandmother, told The Associated Press in an interview Monday that after the crash she wondered, "What was the driver thinking?" The baby's injuries were "consistent with a heavy force/pressure", the sheriff said in the statement.
"She would like to return home, and given her age, that may be appropriate", Harless said. Girl Scouts sang songs in memory of the victims, who were members of Troop 3055.