DS is nearly 4 and gets up in the night to use the loo independently. Would not be safe with a potty in the room, it would get knocked over.
DC2 is 19 months and has started putting leg up to side of cot - actually getting a foot on the top of the rail. I will check if while in gro bag or just when napping out of gro bag.
We used to put the stair gate on when we took the side off the cot bed for DS. We only took it off when he started to be dry at night.
There is also a stair gate at the top of the stairs so if DC2 could get out of their joint bedroom then nobody would fall down the stairs and DC2 cannot yet open doors with handles, so couldn't get into our bedroom if we wanted to shut the door, or the upstairs study, but the bathroom door doesn't shut firmly and it's hard to keep all bubble bath etc out of reach, DS has a step to climb on the loo so DC2 could climb up.
I have no idea what we're going to do when we need to take the side off the cot!