I ordered this to fit a travel crib that I use for my granddaughter. The mattress that came with it was too thin and hard. I like the quality of the crib mattress, but I should have measured the travel crib more carefully as the crib mattress doesn't fit that well. My granddaughter is 16 months, so is old enough to put a folded towel in the space around the crib with no safety concerns, however, I would not recommend that strategy for a younger baby. Also, a word of note if you do purchase: you will need to also purchase a plastic protector sheet, as the mattress is not waterproof!