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Choosing a Bedside Cot Mattress The health and well-being of your child is dependent on the mattress you choose for the cot that is placed beside your bed. Mattresses that are firm prevent babies from sinking in the mattress, which could hinder their breathing. This mattress is GREENGUARD Gold Certified and free from formaldehyde, fiberglass and chemical flame retardants. It also has two-stage construction with one side designed for infants and another for toddlers. Waterproof You should