According to the SQ website, "The stroller must meet SIA’s standard cabin bag dimensions (up to 7kg and sum of length, width and height should not exceed 115cm) and must be able to be stored in the cabin overhead compartment."
You can find the policies of other airlines in this article too! http://mommypoints.boardingarea.com/2017/04/23/airline-stroller-policies-around-the-world/
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