Citizenship by descent
122.—(1)  A person born outside Singapore after 16th September 1963 shall be a citizen of Singapore by descent if at the time of the birth his father is a citizen of Singapore, by birth or by registration:
Provided that such person shall not be a citizen of Singapore by descent unless his birth is registered in the prescribed manner at the Registry of Citizens or at a diplomatic or consular mission of Singapore within one year of its occurrence or, with the permission of the Government, later:
And provided further that where such person is born of a father who is a citizen of Singapore by registration at the time of the birth, he would not acquire the citizenship of that country in which he was born by reason of his birth in that country.
(2)  A person who, being a minor, becomes a citizen of Singapore by descent shall cease to be a citizen of Singapore on attaining the age of 22 years unless within 12 months after he attains the age of 21 years he takes the Oath of Renunciation, Allegiance and Loyalty in the form set out in the Second Schedule and where the Government so requires divests himself of any foreign citizenship or nationality.