A poem or famous saying about a mother's suffering for her children is that the pregnancy is heavy in October and the reward is light.

Mother is a child's address to his mother. Sociologically, a mother can refer to a woman who nurtures and nurtures children. Legally, a woman can also adopt a child through legal channels, or marry a man with a child and then become the legal mother of the child.

Those who become mothers through adoption are called foster mothers, and those who marry men with children are called stepmother, stepmother or stepmother.

Biologically, half of the paired chromosomes in the daughter's somatic cells are provided by the mother's eggs, so the genetic relationship can be identified by DNA analysis. When the father's sperm is combined with the eggs, only the genetic material of the nucleus is provided, so the mitochondrial DNA in the daughter's cells comes from the mother and can be used to identify the maternal family tree.