How did slavery affect Frederick Douglass' relationship with his mother?

Frederick was taken away from his mother at a very young age, and he only saw her four or five times throughout his life. They had no real relationship.

My mother and I were separated when I was but an infant—before I knew her as my mother. It is a common custom, in the part of Maryland from which I ran away, to part children from their mothers at a very early age. Frequently, before the child has reached its twelfth month, its mother is taken from it, and hired out on some farm a considerable distance off, and the child is placed under the care of an old woman, too old for field labor. For what this separation is done, I do not know, unless it be to hinder the development of the child’s affection toward its mother, and to blunt and destroy the natural affection of the mother for the child. This is the inevitable result. I never saw my mother, to know her as such, more than four or five times in my life; and each of these times was very short in duration, and at night.

Douglass and his mother were both slaves, so they were separated when he was very young.