With baby #2 here, it was time to get a new mattress for my toddler as she transitioned to her toddler bed. This mattress is 2 stage- so you can use one side for infants and the other for toddlers. My toddler has a history of NEVER sleeping through the night, and I never realized she could be uncomfortable. Ever since she's been sleeping on this mattress, she has slept through the night, and even told me her bed was cozier. I'm not saying this mattress is sprinkled with magic sleeping dust, but after going through 2 previous mattresses with my toddler, I have to believe that this mattress was comfortable enough for her to remain in her bed throughout the night.
I love the "green" features of this mattress, and would highly recommend it as the only mattress you will need from birth, until your baby is in a twin or full bed.