I got a rail for our queen bed. Tbh it was a pain and I ended up pushing the bed against the wall after a couple of months of using it.
I agree with the rail.
However I've co-slept with all my kids and I never had one, it really depends on each baby though... Usually I just slept with them in my arms.
If she's rolling off though, a rail sounds like the best way to go.
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