The person or institution with whom the child is placed shall give the child a name; the place in which the child is found shall be known as the legal place of birth; and the date of birth shall be determined as closely as possible and shall be known as the legal date of birth.
Source:
Section 102510, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=102510..