Floor bed mattress for under 1s

I'm looking at floor beds in a UK single size but the mattress I can get with the bed (Stompa from Roomix) says suitable from 18 months and another I looked at (from the same company that makes the mattresses for my next to me crib - Little Green Sheep) says suitable from 4 years. Any recommendations?

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Thank you. I looked at ikea but I need at least 3 sides with bars as the room is tiny and 3 sides will be against the wall. Most floor beds have no sides at all and Roomix can customise (so I can ask for the bar spacing to meet UK regulations for cribs) which is good. I'm now looking at getting the same stompa mattress (S Flex Airflow) from amazon as its £50-60 cheaper than ordering it with the bed. She's still in my room at the moment but she's turning 6 months soon and moving loads in her sleep - or not sleeping like last night when I watched her contemplate kicking me in the eye 😂

https://amzn.eu/d/0ZzpqKL It's a little expensive but it'll last a long time x

Thank you, we got one from Roomix and its perfect (I was able to make adjustments to it with regards to bar distance etc). The room is a tiny box room so barely just fits the bed and so unfortunately we couldn't have a house one as the frame for it would have to go up through the windowsill. We also wanted completely open on the one side but 3 sides to go against a wall, which nowhere else seemed to do 😁 The mattress in the end we got from Amazon, the same Stompa one that we'd have got if we ordered it from Roomix but slightly cheaper. I think it's the S Airflow or something like that. It's firm, but I've fallen asleep on it a couple times haha!