Conn. Gen. Stat. § 46b-478: Rules for acknowledgment of parentage.

(a) An acknowledgment of parentage may be signed before or after the birth of the child, except that an acknowledgment signed by a presumed parent under subdivision (3) of subsection (a) of section 46b-488 may be signed only after the presumption is satisfied.

(b) An acknowledgment of parentage takes effect on the birth of the child or filing of the document with the Department of Public Health, whichever occurs later.

(c) An acknowledgment of parentage signed by a minor is valid if the acknowledgment complies with the provisions of sections 46b-450 to 46b-553, inclusive.