In a nutshell the little green sheeps best selling mattress award winning cot mattress that provides the perfect support as your child grows entirely free of chemicals and comes complete with our 5 year guarantee 69x139cm and 10cm deep to fit mamas papas 400 size cot beds this double sided mattress offers a choice of firmness to grow with your child one side is firm as recommended for babies up to 18 months or simply twist for a supple latex side which is durable and comfy for when