Bed guard to recommend

Hmm, for a 1.2m cot with a 10cm mattress, the main thing to check is that the bed guard's height clearance actually works with a low mattress like that, some guards are designed with taller mattresses in mind, so the fit can be off. AiHome is one brand that's come up quite a bit; they specifically design their rails for local Singapore and Malaysia bed sizes rather than the standard 2.0m European ones, which makes a difference for sizing. My neighbour was looking at one for her toddler's transition bed and mentioned the foldable guardrail option is handy since you can fold it down when you're settling the child. That said, with only a 10cm mattress height, just double-check the rail's gap clearance at the bottom, you want it snug enough that there's no risk of the little one slipping underneath.