that said, as a PP mentioned Clark rubber do foam mattresses, which when the kids are small and lightweight do really well for the course of time that it would be used.
We got the extendible bed from Ikea, it starts off as a toddler bed and you can make it bigger as they grow, we were going to buy a single bed mattress but as you said their sizes are all weird, so we just got the inner spring mattress that goes with the bed, it's very comfortable.
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