Hi there, My 9 week old who is currently in a sleep swaddle has been moving so much in his sleep. He will move to the edge of the bassinet during the night with his face pushed up on the mesh or I have woken up to him laying parallel on the bottom of the bassinet! We have removed all blankets for safety but we’re really concerned about his breathing & general sleep safety so unsure how to manage this.. Does this mean he is really for arms out of the swaddle? Thank you so much

Many babies will wriggle & change position at a younger age.
While most babies do not roll intentionally till about 3 months, some do roll early.
Also, some babies just do not respond well to wrapping & like their arms free.
Often these babies like their arms free or like to touch their face or suck fingers & will wriggle to get free.

I think you should move him to his cot & cease wrapping or wrap only under her arms (ie with arms free as for 3mth old)).
He maybe be very close to rolling.
Baby needs arms free & the space of the cot to roll safely.
Red Nose recommends to “modify a wrap” once baby is around 3 mths of age in preparation for rolling (if they are not already rolling)

Once baby is rolling or making an attempt to roll, then wrapping needs to be ceased.
https://rednose.org.au/article/wrapping-babies

Once baby is showing signs of being able to roll, it’s time to move baby to a safe cot – this is usually around four months, but it will depend on your baby & can be earlier than that.
https://rednose.org.au/article/bassinets

If he appears to be intentionally rolling, please see the following info
https://rednose.org.au/article/what-do-we-do-now-that-a-baby-has-started-to-roll-over