A.F.
My son was climbing out of his crib at 16 months, at that age I thought it was too early for him to move to a toddler bed, so I got the crib net. It fits in the crib and looks like a bug net you use to keep the bugs off your food when you're camping. lol. That worked well until I thought he was old enough for the switch, the zipper is on the outside so he couldn't figure it out.
When I did switch him to a toddler, I did what I did with my older daughter, and put a gate up in his doorway. He couldn't get out of his room, but could still hear and see me, and eventually would just get so tired that he'd crawl back into his bed. He now sleeps peacefully thru naptime and bedtime. Hope this helps.