Category Crib Mattress Fit, Safety & Care

Learn why a crib normally needs one correctly fitted mattress, when a spare can help, and why stacking mattresses or adding padding creates problems.

Learn where to place a crib safely, including clearance from walls, windows, cords, heaters, furniture, and other hazards a growing baby could reach.

Learn how crib mattresses relate to SIDS guidance, why no mattress prevents SIDS, and which firm, flat, bare-sleep setup checks matter for infants.

Learn how crib mattress thickness affects fit, sheet security, rail height, and safe use, plus why the crib maker's stated limit matters most.

Use this crib mattress size guide to compare full-size and mini-crib dimensions, measure correctly, check edge gaps, and avoid incompatible replacements.

Learn how to check crib mattress fit, measure edge gaps, spot lifted corners or compression, and confirm the mattress matches the exact crib model.

Learn what makes a suitable baby sleep surface, including firmness, flatness, correct fit, approved products, fitted-sheet use, and signs a setup is unsafe.

Learn how firm a crib mattress should be, what firmness does and does not mean, how to check the surface, and when softness or sagging is a concern.

Compare foam and innerspring crib mattresses for firmness, weight, edge support, cleanup, durability, and fit so you can choose the better design.

Learn why a flat crib mattress matters, how to spot sagging, tilting, gaps, or raised corners, and what to check before your baby uses the crib.