We bought this mini crib because of it's size and it's supposed to convert to a twin size bed.  Although it served as expected as a crib, it does not convert to a twin frame as advertised. 
The manual says that it can be converted with the conversion kit, but the manufacturer doesn't sell the kit, it doesn't exist. Besides only some of the parts are sold anywhere. The manufacturer's website actually recommends buying an adjustable frame to convert it to a twin, which we did. However, the headboard doesn't fit a standard twin frame.