The Darlington Cot Bed will last little one all the way from baby to toddler. The mattress base has 3 height positions so mum can have it at the highest position for lifting a young baby in and out. Then, as little one learns to sit and stand, the mattress base should be lowered down to prevent them climbing out. The cot bed sides are fixed and feature protective teething rails to give little one something to chew on whilst also protecting their gums and of course the top of the cot. When your toddler is ready, this cot bed converts easily into a toddler bed so mum can continue to use it until child is around 4 years old. When in toddler bed mode, the mattress height is low enough for little one to climb in and out themselves. Mum will need a cot bed size mattress (140 x 70cm) to complete this Darlington Cot Bed.