Hi there, My 10 week old son has been wriggling to the side of his bassinet and squashes his face against it. I wake up and have to move him from that position to the middle of the bassinet multiple times a night. He is quite a big boy.. he weighs in at 6.6kgs & is quite long. I have also noticed he can now successfully roll to his side when he wants to. Please let me know if it’s time to transfer him to the cot as I’m finding he continuously wriggles and covers his face with the side wall off the bassinet. I worry he might obstruct himself from breathing properly!

I think it is time to move your baby to a cot & cease wrapping if applicable.
Babies need their arms free & space to move & roll safely.

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 her new environment as safe as possible.

Ensure that the cot mattress is firm & flat & there is nothing soft or loose in his cot.
You can try to turn him back, but most babies will just roll back to the tummy.
Increase tummy time if you are concerned about his upper body strength.
Always continue to place baby on back to sleep.

Red Nose has the following general information now that he is rolling.

Give baby extra tummy time to play when awake and supervised as this helps baby to develop stronger neck and upper body muscles which in turn enables them to roll back over.
Make sure that baby is on a firm and well-fitting mattress that is flat (not tilted or elevated).
Make sure that baby’s face and head remains uncovered (do not use lambswool, doonas, pillows, cot bumpers or soft toys)

As babies grow and develop they become very active and learn to roll around the cot.
At this time, continue to put them on the back at the start of sleep time, but let them find their own position of comfort.
By this stage it is not necessary to wake during the night to turn baby over to the back position

Do not use any devices designed to keep baby in a particular sleep position.
https://rednose.org.au/article/what-do-we-do-now-that-a-baby-has-started-to-roll-over