The endometrium is the innermost layer of the uterus that contains the lining which is responsible for accepting and nourishing a fetus during the pregnancy process. The lining of this cavity changes with every monthly cycle in response to the primary female hormones produced by the ovaries: estrogen and progesterone.
If one parent is more stable than the other, judges can decide to award primary custody to that parent. As a result, parental fitness is often a mechanism used in custody battles. Each state has its own set of rules regarding what makes a parent unfit.
Failing to provide food, clothing, or protection to the child may be part of the definition of an unfit parent, as can addiction and substance abuse that results in abuse of the child or dangerous child neglect. A parent with an emotional or mental instability or disability may also be found to be unfit.