I do playpens until at least 2 (right now my two 2.5yo's are still in them tho and have LOTS of room) and than I have sleep mats and cots for the older children. I have the my regalo sleep cots from Walmart in the states. I like them but unfortunately one broke about 2 years (I think?) after having it.

This post makes me think that I should get more cots though lol. It would be nice to get rid of the play pens. I just hadn't thought if it since it's so routine but now thinking about it, I think they're ready! Well one is anyways lol....the other one would maybe still get into things!