B.
My Second daughter started jumping out of her crib at 17 months also. We lowered the side of the crib and taught her to climb out safely. We also put up a baby gate (she climbed that too so we switched the lock on her bedroom door (locked her in, it sounds horrible but we had a 1st floor master and had to keep my acrobat safe) and put a monitor in her room so we could hear what she was up to.
Good Luck
B.