The Hand That Rocks the Cradle (1992) Review
As the poem goes, the hand that rocks the cradle is the hand that rules the world. Rebecca De Mornay stars as the widow of a doctor who takes his own life after being accused of inappropriately touching his female clients, and she decides that her hand should be the one to rock the cradle of the one who caused her so much pain.
After waiting a few months for things to settle down, she insinuates herself as a nanny to the one who started the whole mess, and at first things go swimmingly. But slowly they start to fall apart. Mentally disabled helper Solomon (played excellently by Ernie Hudson) sees her breast feeding the baby that she is supposed to be watching, and she makes short work of him by planting some evidence to get him kicked out.