Enforcement Rules of the Child and Juvenile Welfare and Rights Protection Act Article 5

The calculation of the seven-day reporting period for the birth of a fetus, as described in Article 14, Paragraph 1 of the Act, shall begin on the day following the birth. The reporting date shall be recorded as either the date of online data transmission or the date shown on the postal stamp. For reports not submitted online or by post, the reporting date shall be the date on which the competent authority receives the reports.
中文原文 兒童及少年福利與權益保障法施行細則第5條
本法第十四條第一項所定七日內,自胎兒出生之翌日起算,並以網路通報日或發信郵戳日為通報日;非以網路通報或郵寄者,以主管機關收受日為通報日。

English translation for reference only; the Chinese text prevails. Not legal advice.