3 position adjustable mattress base - allows you to lower the height of the mattress as your baby learns to sit and stand. Teething rails - protects your baby's gums once they are teething and have started to chew. Converts to junior bed. Cot specifications:Size L144, W77, H91cm. Mattress features:Mattress size L140cm, W70, D70. Mattress not included. General information:Suitable from birth to 4 years. Self-assembly. EAN: 5021669803318.