The obaby emily cot bed has 3 mattress base heights the top height allows easy access to your very young baby the mattress base can then be lowered two further positions as your child grows to convert your cot bed you simply remove the sides and divide the ends to leave a toddler bed suitable up to 4 years old features adjustable three position mattress base two split end panels for converting into junior bed requires mattress size 140 x 70cm available separately