Hello,
The advice over here is not to have these cot bumpers at all. They are a relatively new import to this country, and can be dangerous, especially if not fitted right.
When I bought my cot, I was told definitely not to fit them until around 6 months (when the baby is able to roll out from under them if they do fall on top of him, or strong enough to push them away).
This is just another of those conspiracies to make the parents' job harder :roll: :lol: . You don't want your lo to bump their head, but then you don't want them to be suffocated either! I have just been working on the basis of the less loose fabric in the cot, the better (no loose blankets, teddy bears, etc). He sleeps in a gro-bag, and if he needs an extra blankie, I anchor it under the mattress. Needless to say, my mother thinks I'm mad (I think this panicking over things like this is a relatively new thing), but at least I sleep better at night!
Caroline