Hi Cyn, thank you for leaving a question. Anyone below the height of 1.35m will be required to be secured with a child restraint appropriate for a person of that height and weight. Those with a height of 1.35m and above, irrespective of their age, will be required to wear a seat belt. For further information please refer on this: https://www.carclub.com.sg/child-on-board-child-seat-rules-in-singapore-you-should-be-aware-of/