This cot bed has 3 mattress base heights please note mattress is not included a teething rail to protect your little ones teeth and gums and can be easily converted into junior bed for when the time is right this cot bed would suit any nursery and is suitable from birth to the age of 4 approximately mattress not included features adjustable three position mattress base two split end panels for converting into junior bed protective teething rail requires mattress size 140 x 69cm not inc