Authorities are investigating the death of a seven-week old baby girl early Monday morning who suffered “suspicious injuries” in northwest suburban Round Lake Park.

About 3:10 a.m. Monday, officers and an ambulance were sent to an apartment in the 0-100 block of East Main Street, according to a statement from Round Lake Park police.

The ambulance was sent to the apartment for a seven-week old infant having trouble breathing, police said. The baby girl was taken to Advocate Condell Medical Center in Libertyville, where she was pronounced dead.

An autopsy Tuesday by the Lake County coroner’s office found “suspicious injuries” on the infant, according to a statement from the Lake County Major Task Force, which is assisting Round Lake Park police with the investigation. However, the infant’s cause and manner of death are pending additional testing, which could take several weeks.

The state Department of Children and Family Services is also investigating, according to an agency spokeswoman. DCFS has not had any prior investigations involving the family.