not necessary for now the bumper. as baby don't really flip or roll around yet. keep it cluttered free for new born baby as it could lead to suffocating the baby. just a nice comfortable mattress and a head pillow will do. :)
Not sure if bumper recommended because its a hazard especially for babies that can turn and flip around already. You can google to find out about why is it a hazard.
I use the same crib, baby is 2months old now. I put bumpers as i feel its good to block aircon 😂 and my baby is quite tall his hands might hit until the crib
Personally, I think bumpers can come at a later time, after baby learns to flip and crawl.