My 8mo lg has slept in her cot 11pm-7am since 12 wks. Recently she seems to have separation anxiety and will only settle in my bed where she will sleep for hours. My only concern is her rolling. I follow cosleeping guidlines but end up awake alot of the night stopping her from rolling onto her tummy as we have a memory foam mattress that is quite soft. How does anyone else deal with this, is it ok to tummy sleep or should i not have her in my bed at all? If it makes any difference she was a preemie with a low birth weight. Not sure whether that makes a difference but i have seen it increases risk of SIDS but unsure of what age this stops being a 'thing'?