my church has a case a few yrs before :
baby crawled out of the baby's bed even the bed was at the lowest position n fence was at the highest position. u can't imagine how "powerful" the babies are.
my baby has been sleeping in a junior "mother" bed with the maid sleeping in the "son" bed since his 10th month. when he wakes up and the maid is doing housewk, he will crawl down his "mother" bed to the "son" bed and then to the ground. n when he wants to go to bed or go to the window watching the cars, he will crawl up the "son" bed and then his "mother" bed. seems quite safe.
of course the drawback is the maid is sleeping w/ him. but owing to limited space, seems no other choice.