Helen i have a cot bumper for ruby,she is another that ends up upside down.Millana always use to wake with bumping her head and didnt want a repeat of getting up to resettle.Mine goes all the way round except one end and its a 1 peice.I have seen individual bumpers but you could sew`a safe one yourself perhaps? I think the sids thing is a risk but ruby is pretty active im sure she could push herself away?