Are All Baby Cot & Cotbed Mattresses the Same?

New parents to be will spend weeks or even months deciding on the style of cot or cotbed and nursery furniture, and once that is all done, a final after thought will be the mattress. Really it should be the other way around. The mattress is the most important decision in the nursery, if you think about it for a while, how many hours do you think your baby will be laying on the mattress you have chosen, through all their crucial developmental months as their backs and neck develop?