The surrender of any such child shall be by an instrument in writing, signed and sealed by the parties thereto and duly acknowledged, and the age of such child shall therein be stated as correctly as can be ascertained. Any such written instrument, when duly executed and acknowledged, shall be presented within 30 days to the Resident Judge of the Superior Court residing in Kent County for approval, and, if approved by such Judge, it shall be admitted as evidence in all courts of law or equity in this State.
No written instrument for the surrender of any such child made under the provisions of this section shall be subject to assignment or transfer.