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Choosing a Bedside Cot Mattress The choice of the correct mattress for your cot bed is vital to your baby's health and well-being. Firm mattresses can prevent your baby from sinking too deeply into the mattress. This could cause breathing issues. This mattress is GREENGUARD Certified Gold and is free of formaldehyde and chemical fire retardants. It also has two-stage design that has one side for babies and another for toddlers. Waterproof You'll want to select a mattress that is waterproo