Shamsid-Din Abdur-Raheem of Galloway Township appeared Monday at an arraignment in New Brunswick via video link from the Essex County jail, where he is being held on $2 million bail. A public defender entered the plea for him.
The baby's mother was in court and watched without visible reaction.
Abdur-Raheem is charged with killing Zara Malani-lin Abdur after allegedly snatching her maternal grandmother Feb. 16.
Prosecutors charge that Abdur-Raheem tossed the baby from Driscoll Bridge into the Raritan River. The child has not been found.
Abdur-Raheem has already pleaded not guilty to several related charges.