This mattress fit my crib better than my last one as it is more squared on the corners rather than more rounded. I like the feel of the material it is covered in. Although the baby side of the mattress is rock hard in my opinion and my 7 month old hated it, so we swapped it to the toddler side and all has been fine. I couldn’t find any instruction on when you need to swap it from baby to toddler side but I’m assuming it’s before 7 months.