Regardless of his or her age, a child shall be deemed to have entered foster care on the earlier of the date of the jurisdictional hearing held pursuant to Section 356 or the date that is 60 days after the date on which the child was initially removed from the physical custody of his or her parent or guardian.
Source:
Section 361.49, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=WIC§ionNum=361.49..