Purpose and applicants
A Singapore citizen under 21 holding a foreign passport can request a Right of Entry endorsement to facilitate Singapore clearance using that passport. The passport name must match the citizen’s record. A parent/proxy requests for a child under 16; follow ICA’s authorisation requirement.
Request, transfer and fee
Use ICA’s request form with the foreign passport and relevant identity/authorisation documents. The service is free; complete requests normally take three working days. When the foreign passport changes, request transfer/update for the new document rather than relying on the old endorsement.
Official ICA source
Written independently from ICA’s English original. The linked source supplies the complete document and subsequent updates.

