Police say the suspect, Marina Lopez is now in custody and her child is safe and being checked out at a local hospital.
Charges are pending.
Authorities say 7-month-old Mario Danner, Jr., was taken by his mother, Marina Lopez, without permission Tuesday afternoon.
Lopez, who police say is bi-polar, is not Danner's custodial parent.
The boy was at an ACS facility in Harlem for a supervised visit with Lopez when she allegedly left with him.