KATY® Superior Deluxe Spring Cot Bed-Junior Bed Sprung Mattress 140x70 x 10CM THICK British Made With High Grade Density Foam CMHR28 We've taken the decision to took him out of the moses basket so young due to the poor support from the rocking frame (and a lot My son is now over 2 year old and have been using this mattress since he was 3 months old. We've taken the decision to took him out of the moses basket so young due to the poor support from the rocking frame (and a lot of reflux). This mattress will fit a cot beb (aka a cot that changes into a toddler bed) not a cot only. So new parents make sure you're checking the dimensions ! It should be written somewhere on the bed frame by the manufacturer. The mattress itself is definitely soft not firm. I remember reviews pointing this out while looking around. It's true from an adult point of view. However, your child will probably find it "firm" due to its much lighter weight. It's definitely 'springy...