Jessica Adams of Allentown was sentenced to 15 to 30 years in state prison Tuesday.
Adams pleaded guilty in July to third degree murder for the death of her 5-year-old son.
Police reported Adams beat the boy, named Cashmiere Hill, at her home at 107 N. 12th St. on Nov. 29. The following day, the boy died in the hospital of multiple blunt force injuries to his head.
Adams was 24 when she was arrested. She was scheduled to be sentenced in August, but filed a motion to withdraw her guilty plea.
In Lehigh County Court on Tuesday, Adams dropped her motion to withdraw her guilty plea and was sentenced.