I am browsing nursery mattresses on John Lewis - and my husband is suggesting we go for an organic mattress for the cot bed - as it only costs slightly more than the next one down, which is pocket sprung. However, much as I appreciate it's made from lots of natural fibres (coconut fibre, natural latex, wool, apparently) I can't help thinking that a good old metal spring or two, is going to give more support, which should be the over-riding factor, given it's going to be slept on for a few years - and eventually jumped up and down on - by a toddler. Any views?!