Article 2. Determination Of Mother And Child Relationship of California Family Law Code >> Division 12. >> Part 3. >> Chapter 4. >> Article 2.

(a) Any interested person may bring an action to determine the existence or nonexistence of a mother and child relationship. Insofar as practicable, the provisions of this part applicable to the father and child relationship apply.
  (b) A woman is presumed to be the natural mother of a child if the child is in utero after the death of the decedent and the conditions set forth in Section 249.5 of the Probate Code are satisfied.