We put our 21m old in a big boy bed a couple of weeks ago and he's been fine, even for naps until this week.
Have tried repeatedly silently putting him back in (he just giggles and leaps out to start banging on the door), have tried telling him off, have tried ignoring him completely (he starts goodnaturedly trashing his room.) When I open the door he runs back to his bed giggling like we're playing chase. Not even sure how we did it last night, think eventually I just shouted at him and wore himself out crying.
Anyone been there? What's the best route to take to get through this? Cheers, Liv