Nathaniel Ambrose, 23, of Lyle was charged on Wednesday in Mower County District Court with felony first-degree assault-great bodily harm.

According to the court complaint, the Lyle Police Department was contacted at 7:36 p.m. on Saturday by the Olmsted Medical Center about an 8-week-old male infant that had been physically abused. The victim had been brought in by his mother and was then taken to Mayo Clinic Hospital, St. Marys Campus with facial bruising, bruising on his scrotum, rectal tearing and a possible brain bleed. Staff at the pediatric intensive care unit at St. Marys told police they had found a cut on the inside of the victim’s mouth and that the injuries were consistent with child abuse.

Police interviewed the child’s mother, who said that Ambrose had been taking care of the victim while she was at work, the complaint states. She said the victim had not been acting the same and had not eaten since 10 a.m. She thought he was “just tired,” but was later awakened by Ambrose, who said he saw blood coming from the victim’s mouth.

She then took the victim to see family, who told her the victim needed to go to the hospital. When advised that the injuries were non-accidental, she said the victim was “fine” when she left for work and denied knowing how the he got injured.

The complaint states police then spoke to the victim’s aunt, who said the victim was “fussy” and that his eyes were not “normal.” She said he would not take a bottle and would not cry.

Police spoke to Ambrose, who said the victim had been coughing up blood from a cut on his lip, the complaint states. He said he took the victim into the shower because he was “limp” and lightly shook the victim and tapped his cheek, at which point the victim started acting normal. Ambrose claimed the victim was acting normal the rest of the day and that the victim’s mother called him to tell him the victim was taken to the hospital an hour after she had left to visit her relative. He denied knowledge of the victim’s injuries.

A Mower County detective met with a doctor at the Mayo Clinic’s Child and Advocacy Center on Monday to discuss the victim’s “non-accidental trauma and acute neurological symptoms,” the complaint said. Medical notes indicated, “the combination of intracranial bleeding, mental status changes, seizures, and facial/head bruising is strongly suggestive of abusive head trauma. Other ‘additional’ features concerning non-accidental injury include the subconjunctival hemorrhage(s) and the torn labial frenulum. (The victim’s) anal dilation and extensive perinea/buttock/groin bruising also raises concerns for possible sexual abuse.”

The detective then spoke to Ambrose, who said he had been in the victim’s room “two weeks ago” to fix Ambrose’s bike and had tripped and scratched the victim’s head with his thumbnail, the complaint said. He also repeated his story about taking the victim into the shower after seeing blood coming from his mouth. When the detective advised Ambrose of the victim’s life-threatening injuries, he again denied knowledge of the injuries. He also denied sexually assaulting the victim. He was then arrested.

The detective then spoke with the victim’s mother, who said Ambrose called her at work to say the victim was “fussy,” the complaint states. He later texted her to say the victim was not acting like himself, would not look at him, would not cry, and that there was “something wrong with him.” When she came home from work, she saw Ambrose cleaning out the victim’s mouth with a Q-tip because he saw the victim coughing up blood. She said the victim looked “really, really tired … [and had] no energy to wake up.” While visiting her family, her sister and sister-in-law noticed the victim’s eyes were shaking and looking off to the side. It was at the hospital that she learned the severity of the victim’s injuries.

She told the detective that she did not believe Ambrose would harm the victim, the complaint said.

Ambrose will appear in court again on Sept. 10.