he stands in secret

I catch my son free standing in his crib when I come in after nap time. In my imagination he does laps in his crib to practice for the day when he runs away from his surprised and confused mother. I am probably wrong, he is generally so startled by the fact that he is standing he falls, boop, on his butt. It is impressive how intelligent he is, nothing gets by him, while he enjoys his puppets he knows what's up...it's just your hand and with a quick grab he has it in his fist and is cramming it into his mouth. The backyard is a mine field of pebbles all of which appear to be edible in his mind, this is stress full but we're learning to distract him better. Things are fun, things are great, time is flying...