Police in Odense say two of the children were taken to emergency rooms today after the incident. Police earlier had reported that the animal was a bull.
Police say the cow stepped on an 11-month-old girl's head and on a 2-year-old girl's chest. The infant didn't sustain any serious injuries while the other girl suffered a perforated lung. A 7-year-old girl suffered a broken leg and another 7-year-old girl was bruised.
The children were from nearby schools visiting the annual cattle show in Odense, is 105 miles (170 kilometers) west of Copenhagen.