Hi Rednose, My second baby has just turned 3 months old, she has been practicing for a while and can now roll from back to tummy confidently just not the other way round. She sleeps in an arms out sleep suit in a bassinet. We always put her on her back to sleep however I am finding that she immediately rolls over to sleep on her tummy, but I’m wondering if this is too early for tummy sleep as she can’t roll the other way. I’m finding this quite stressful at night and often wake to roll her over to her back, also should we move her into a cot now? We are following all the safe sleep advice just as we did with our first baby but I wasn’t ready for her to start rolling so soon! She is formula fed and I know this means they can fall into a deeper sleep so this plays on my mind with the tummy sleeping.

Red Nose recommendations are to “always place baby on back for sleep” NOT baby must always sleep on their back.
https://rednose.org.au/article/red-nose-safe-sleeping-recommendations

Most babies will be rolling over by 4- 5 months. Some earlier, some later.
This is very normal as babies grow & become stronger.
Many babies then prefer to sleep on their side or tummy.
This is not something that needs to be stopped. It is important to make the “new” environment as safe as possible.
https://rednose.org.au/article/what-do-we-do-now-that-a-baby-has-started-to-roll-over 

Good to see you have stopped swaddling/wrapping, but she also does need to move from bassinet to a cot.
Babies need arms free & the space of a cot to roll well & safely.
Ensure mattress is firm & flat & nothing soft or loose in her cot.
Continue to always place your baby on back for sleep.

How does she go with tummy time when awake?
Increasing tummy time when awake is important to build upper body strength to roll well (both ways)
Is she rolling from tummy to back during tummy time, holding her head well &/or reaching for toys?

Parents are not expected to sit up all night observing baby. This is not achievable in long term
What happens if you gently roll her back when you see her sleeping on her tummy?