Hi, I have a 5 month old who has become quite good at rolling from his back onto his stomach. I sleep him in Love to Dream sleep bags, however I still find him trapped between the slats of the cot. I watch the video monitor constantly throughout the day but don’t know what to do when we move him to the cot for night sleeping. I know I’m not meant to use bumpers, but is there some sort of alternate for this situation? Short of putting him in the portacot to sleep, I’m not sure what to do.

Red Nose recommends that you keep all soft & padded objects out of the cot. This is particularly important as baby is learning to roll.
Is your baby still being swaddled? ie are his arms free from the sleep bag that he is in?
It is important that baby has arms free when rolling.

It is essential to discontinue wrapping as soon as baby starts showing signs that they can begin to roll, usually between 4-6 months.
If you wrap your baby, consider baby’s stage of development. Leave arms free once the startle reflex disappears around 3 months
https://rednose.org.au/article/what-do-we-do-now-that-a-baby-has-started-to-roll-over

Red Nose does not recommend using soft & padded bumpers in the cot, due to potential for suffocation risk.
Most products that will cover cot sides are soft & padded.
https://rednose.com.au/article/at-what-age-can-i-introduce-cot-bumpers-and-pillows

It is not uncommon for babies to roll around in the cot & sleep in many different positions.
Some babies do roll against the cot sides at time.

Many parents are become concerned about the potential for injury from the infant bumping up against the cot sides, or getting an arm or leg stuck between the slats.

United States Consumer Product Safety Commission data has shown that infants suffer essentially no long term injuries from contact with cot slats.

When we look at products to buy for a new baby, we need to ascertain not only whether it is effective for the required purpose but also is it safe to use under all circumstances of use especially where the baby may be unsupervised. This is particularly important when selecting products which babies will use when asleep.
https://rednose.com.au/article/baby-safe-sleeping-products