Not Just Another Proud Parent

I'm pretty sure my 6 month old isn't actually supposed to do this. He's not supposed to cruise either but he's starting to do a little of that, too.
Yep, he's motor advanced.
He rolled over at 3 months and I actually looked askance. After all, the pediatrician in me knew that early rolling could be a red flag for neurological problems. But he seemed to be otherwise normal, so I just shrugged and smiled. He sat at 5 months. Not super early but surely not late. And now this. According to "What to expect . . .", by the end of this month, he "should be able to bear some weight on legs when held upright". Some weight. By the end of this month.
He can't read yet, so he doesn't know he's exceeding expectations, but he looks mighty proud of himself when he manages to creep from monkey to frog on his rain-forest-play-house-of-wonder. We're proud of him too.
Neither I nor Dave is sure of the source of his skills, but we have a few theories.
1. He has superpowers.
2. The freeze thaw process selects zygotes that have superior physical strength.
3. (And probably most likely) We have always challenged him. He had all the tummy time he could handle early on. We plop him on the floor with a toy just out of reach and let him work for it. We put him in the Bumbo chair when he was 2 months old and the Jumperoo when he was 3 months. We have airplaned him and held him sitting and standing as much as he seemed to be enjoying it. We always smile and laugh and clap and encourage and let him know we're proud of him, he's perfect, and it's all for fun.

He is a source of awe and joy to me every day. Every thing he learns to do, from smiling, to cooing, to raking the proverbial raisin, looks like a miracle. He seems so big and grown up and then, at the end of the day, he curls up on my chest and sings himself to sleep, and I am reminded that no matter how soon he learns to walk away, he'll always be my baby.