While I can't speak to how comfortable my baby is in this, this is my second purchase of this mattress and cover set. My toddler also sleeps on it and it has lasted almost 3 years and is still going, even though he is 40 pounds and jumps on it! The only issue, and why I dropped a star, is to make sure you don't dry the cover too often as it keeps shrinking, and it's now extremely difficult to place on my toddler's mattress. Lesson learned.