Cal. Health & Saf. Code § 1644.7
Any entity that receives genetic material of a human being that may be used for conception shall provide to the person depositing his or her genetic material a form for use by the depositor that, if signed by the depositor, would satisfy the conditions set forth in Section 249.5 of the Probate Code, regarding the decedent's intent for the use of that material. The use of the form is not mandatory, and the form is not the exclusive means of expressing a depositor's intent. The form shall include advisements in substantially the following form:
"The use of this form for designating whether a child conceived after your death will be your heir is not mandatory. However, if you wish to allow a child conceived after your death to be considered as your heir (or beneficiary of other benefits such as life insurance or retirement) you must specify that in writing and you must sign that written expression of intent.
This specification can be revoked or amended only in writing signed by you (and not by spoken words).
You should consider how having a child conceived after your death affects your estate planning (including your will, trust, and other beneficiary designations for retirement benefits, life insurance, financial accounts, etc.) These issues can be complex, and you should discuss them with your attorney."
Ca. Health and Saf. Code § 1644.7