When did you do it for your LO and why? Was it because you felt like it was a good age, did you need the crib for another LO or did your LO try to climb out?

My two year old is still in her crib and we have no issues. We ordered a toddler rail for her yesterday but we aren't sure when we should convert the crib! DH thinks we should just wait a little longer and not mess with a good thing.