We were reading last night after dinner and PJ was on the floor between us playing with toys. I looked up to say something, and PJ's standing there with nothing to nearby to pull himself up. He tottered/walked to my husband as though he'd been doing it right along laughing away.
You should have seen Peter's face. It was priceless :-)
He went from all fours to moving right along.
If his leg musculature keeps growing like that, he should be jumping like a spider before autumn. It might be wise to keep the leash short for a while.