HELP!

Well my little mischevious boy has hit another milestone,
but this one I wish he never discovered. Today I put him
down for a nap and went to the garage to vacuum the car.
A few minutes later Ame came out and said kaipo's light
is one and I think he is out of his bed. I said, "What?"
She replied, "I guess he remembered what I taught him."
Sometime last week she told me they were playing in his
crib (don't ask me why) and she taught him how to climb out of his crib, or I think she climbed out and he watched very carefully! Either way, when I walked in his room he was playing with some toys on the floor. I got mad at him and put him back in his crib, and he did actually go to sleep this time. But......I didn't have this problem with Ame and I wasn't planning on putting Kaipo in a bed yet. I guess I will see if this is a one time thing or if he tries it again, before I make any drastic changes. Any suggestions?