Frederick Hernandez pleaded guilty Friday in Northampton County Court to some charges relating to taking a woman and their child from a Bethlehem home last summer.
Hernandez pleaded guilty to simple assault, recklessly endangering another person and endangering the welfare of children.
The 22-year-old Garfield, N.J., resident has been in Northampton County Prison, unable to post $50,000 bail.
Bethlehem police said the woman and baby were taken from their Bethlehem home against their will by Hernandez. The two were abducted after an argument escalated between Hernandez and the woman inside the home in the 500 block of Sioux Street.
He took them to his home in New Jersey.
The woman allegedly was sexually assaulted by Hernandez, who is the child's father, according to police.
Garfield police found Hernandez, the woman and child at Hernandez's home, where they took him into custody as a fugitive from justice.
The negotiated plea was entered Friday before Northampton County Judge Craig Dally.
Charges withdrawn included rape, terroristic threats, two counts of kidnapping to inflict injury or terror, two counts of unlawful restraint.
Sentencing is scheduled for 9 a.m. April 25.