My son was a natural born climber. He figured out from watching us how to unlock the front door. I was on the third floor folding laundry. He was in the other room so I thought playing. Once I was done with the laundry I called for him. No answer. I checked the third floor. No boy. I called him again. No answer. I checked the second floor and calling him. Still no answer. Now I'm starting to panic. Where can he be? I go down the back stairs, checking the kitchen, dining room and living room. Now I'm panicked. He was just here. Where can he be? I check the front hall and the front door. The hall is clear and the front door open. I run out on the porch, looking for him. No baby boy. I run down the stairs and down the walkway looking up and down the street. My heart is pounding, where is my kid? I'm a nervous wreck but trying to keep a calm head. I go back inside and check for him a second time, still no boy. I'm feeling week in the knees when it dawns on me to check the back yard. I run back out the front door and around to the back and there he is with both of his tonka trucks playing in the yard. I asked him what in the world was he thinking. He said very matter-of-factly that he was just tired of being inside and wanted to play with his trucks outside. He was 3.
Long story short. Don't be panicked if he used the door and leaves, just get a great locking system for the doors so he can't leave when he gets ready.