J.S.
When I had my baby, my son was 3. For the next two years he "created" ways to get out. My kids have an unusual strength to them, so dead bolts didn't work...But we tried, we then bought a double keyed dead bolt (needs a key from both sides of the door) that was the key. But other things we had to do, were: move our garage door button to above the door from the house to the garage (away from his reach, even when standing on a stool). We have a wood fence, so we pad locked both fence gates. And then we found that we had to rescrew some of the wood slates, because he would find a semi loose slat and then push and wiggle until it was loose or broke only at the bottom enough for him to sneak out with no one knowing. The other great thing I did, was put in a HUGE sand box with a playhouse/swing set. Now I can guarantee that he is in my back yard to stay...but now I find neighbor kids joining him, but at least I know where he is!