I recently bought a Little Green Sheep organic mattress for DS (2.5 years) who is transitioning into a toddler bed. I didn't buy the double sided version (one side firm for babies the other softer for toddlers), just the original one, which I'm told is for 0-5 years. DS hasn't tried it yet as it's just arrived, but it feels very firm to me compared with the previous spring pocket one from JL. I actually quite like firm mattresses myself but wondered whether this sort of firmness is suitable for a toddler for their spine? I'm probably overthinking, but is there anyone with experience of this mattress who can advise? How did your toddler take to it and did it soften a bit with time? Thanks!