❤.M.
It depends upon the child.
If they are not trying to escape, then leave them in the crib.
If they have tried to escape, then now is the time to convert it.
We just put a twin mattress on the floor against the wall w/o the box spring when he was ready. Also, added a railing on the side that wasn't against the wall.
Not till about age 3 as he never had an issue.
Don't change him until you absolutely have to.