The invention relates to a mattress for accommodating a person who should keep a certain degree of mobility and to whom it should be easy to administer care, while making sure that the lying person does not risk falling off the mattress when he or she wiggles while unattended. Such a secure fall-prevention mattress mainly comprises a core, retaining means for keeping a person in a lying position on said mattress, and a ballasted assembly. In a preferred embodiment, such a mattress is a mattress for changing young children's diapers.
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