I am going to use cot bumpers. For when LO is smaller I will have the breathing monitor on and an older baby as ISH says though in risk it has enough mobility to move away.
BUT is advisable to not too because some Los like to sleep with their head all the way to the edge causing them to recycle the air they breath if there is an obstacle there and to breath excessive carbon monoxide. Sth like breathing in a bag ifykwim. Normal protective mechanisms will make LO move its head then but as not all Los reach the same central nervous maturity at the same time is advisable to not use them.
the reason I will use them is that my friends LO manage to actually get a haematoma by banging her head on the cot and needed 2 operations
she almost had fully recovered. It all happened when LO was sleeping, a door slammed because of the wind, the LO got scared and banged her head on the edge of the cot
she had a mess bumper but it didn't help unfortuantely
So I am going to use them together with a breathing monitor.
You should try maybe the mess one and see how it goes?
my friends case is probably very rare anyway so don't get influenced by it really.
A pediatrician advised me to tie the bumper a little above the mattress so there is air coming under it too as well as above it ifykwim.
my bumper is arriving this week so didn't try it yet. I will see if that tie a little over the mattress can actually be done...