Mother used to be a more simple and certain concept than father, and for the most part remains so, however with various technical improvements or possibilities since the first test-tube baby there are a number of decomposable aspects of biological and other motherhood.
- Birth mother: the baby came out of this woman;
- Donor mother: The ovum was donated by this woman (who can also be the birth mother but had the egg harvested and then re-implanted after fertilisation)
- Nuclear mother: the nucleus of the ovum which made this baby came from this woman;
- Host mother: the baby came out of this woman, it is implied she is not the nuclear mother;
- Cytoplasmic system mother (Cytoplasmic mother): the ovum, except for the nucleus, which made this baby came from this woman; (this is probably original work, and may be better-phrased)
- Care mother This woman looks after and raises the baby (most usually and redundantly the birth mother)
- and adoptive mother: Becomes a mother after someone else has been the birth mother
One woman might play more than one role.