I was worried about this issue as I am near a stairwell in the family stand. I was particularly concerned for my two young sons. As it was I needn't have worried as our row is two rows up from the sign/bars. However I am sure if a small child sat in the seat immediately to the side if one of these, that the view would be restricted.
Thanks, a little less worried about this now. Holding off going to the ground until the 6th I haven't been able to see if this will be a problem or not. My concern was also for my 2 young children, but I think we should be OK as we are (I think) 3 or 4 rows back from the sign.