Any recommendation for stroller that can sit up to 25kg? Prefer those that are one hand operate.

How about the Maclaren Quest? It is suitable for newborns up till a young child (weighing approximately 25kg) and it is popular for being sturdy, light (6.8 kg basic weight) and can be easily folded or unfolded with one hand. My friend who owns one tells me that it is perfect for a city terrain like Singapore's especially if you take public transportation. It retails for about 499SGD new and you can get it at major department stores. You can also order it online on Lazada.sg :)