Photo: Zara Malani-Lin Abdur-Raheem.
Teams with boats, dogs and helicopters have found no sign of the infant in their third day of searching under a river bridge on the Garden State Parkway.
State Police Sgt. Julian Castellanos said the mission is still a rescue attempt, even though the odds of a baby surviving this long are slim.
Authorities say Shamsiddi Abdur-Raheem snatched the child from her grandmother's East Orange apartment while the mother was getting a restraining order Tuesday.
The father pleaded not guilty Thursday to charges stemming from the disappearance of his daughter.
The 21-year-old appeared composed during his video arraignment in Newark on attempted murder, kidnapping, aggravated assault and child endangerment charges.
There was no reaction from the child's mother, who watched in court.
Shamsiddi Abdur-Raheem is being held on $700,000 bail.