VIROQUA — A 23-day-old infant prosecutors say was battered at the hands of his teenage father had brain injuries and bruising consistent with abuse, according to court documents.

Michael Wojczak, 18, of La Farge admitted shaking and throwing the infant onto a bed May 17 because he wouldn’t stop crying, according to the complaint filed Tuesday in Vernon County Circuit Court. Wojczak is jailed on a $50,000 cash bond and returns to court June 3 for a preliminary hearing.

Wojczak told authorities he shook the child May 11 or 12, and previously had grabbed the baby’s face and squeezed the back of his neck, the complaint stated. Wojczak was charged with two counts of physical abuse of a child.

The mother and Wojczak brought the infant to Vernon Memorial Hospital early May 18 after the baby stopped breathing. The infant’s right eye was swollen shut and he had bruising on his face, neck, shoulder and shin, the complaint stated.

A CT scan at Gundersen Lutheran Medical Center showed two brain injuries. The infant constantly cried in his father’s arms but stopped when given to another person, the complaint stated.

A babysitter told investigators she heard a “big thump” late May 17 when Wojczak was alone in a bedroom with the infant, the complaint stated.