cot bumpers

Lo
 So last night I decided to make the cot bed up, I'm only 32+5 but I've been desperate to get his room started. I'm probably going to have to take it all off when we are moving it around or storing things but I enjoyed it at the time!! Anyway - my midwife said that cot bumpers are not recommended. Is anyone else using them? Is it bad to have them on just to look nice, and then when baby goes in just take them out?