If they are not potty trained and space isn't an issue, I admit I don't worry about transitioning to a cot. However, I was getting tired of play pens and I had one, 2.5, who was potty trained so I put her on the cots. The other one was just under 2 and they both did great!! They never get off them and get into things which was a concern of mine.

Next week I have a young group, 15 months to 2.5 years so the play pens are back with only one on a cot. I have a 2 year old boy who I am going to transition....thanks for the reminder! Lol.