BANGOR, Maine — A Stockholm man charged with sexually assaulting a 1-month-old girl and posting graphic pictures of the infant online has been indicted by a federal grand jury on two additional charges.

Benjamin Rossignol, wearing an orange jumpsuit, appeared in U.S. District Court Wednesday where he entered not guilty pleas to the two federal charges against him. He is planning to change his pleas in the coming month, his attorney Stephen Smith told U.S. Magistrate Judge John Nivison.

“It’s probably going to end in a guilty plea,” Smith said inside the Margaret Chase Smith Federal Building and Courthouse.

Rossignol, 21, was taken into custody at his home in Stockholm, about 20 miles north of Caribou, on Nov. 8, and was charged with sexual exploitation of a minor, dissemination of sexually explicit material, unlawful sexual contact and possession of sexually explicit materials. He has not entered a plea in any of the state charges, Smith said.

Rossignol was indicted by a federal grand jury in late March for transporting child pornography and possession of child pornography.

Maine State Police Computer Crimes Unit investigators discovered that Rossignol took graphic photos of the baby and posted them on the Internet, according to Stephen McCausland, spokesman for the Maine Department of Public Safety.

He has been held, unable to post his $10,000 bail, at the Aroostook County Jail. Typically, whenever there are state and federal charges based on the same case the federal charges, which carry the higher penalties, are handled first.

“We’re anticipating a concurrent penalty with whatever state charges there are,” Smith said after court. “Mr. Rossignol is genuinely remorseful and wants to do the right thing with the situation.”

Nivison set motion deadlines for April 16, and placed Rossignol on the trial list for May in case the plea negotiations fail. Rossignol is expected to change his pleas by the end of the month, but no date was set.

Rossignol is facing a penalty of five to 20 years in prison for the federal charges, Smith said.