wHEN ds was that age i had the cot with 4 sides on up against our bed. He mainly slept in the cot for naps and so couldn't fall out.

He first went to sleep in the cot and when he woke, i could just lift him over the side of the cot into the bed. The cot then provided a side to the bed so he couldn't fall out of bed.

He can now get off bed safely (doesn't that often though), and so i have only 3 sides on the cot and he can crawl from cot to bed or i can pick him up.