From Brian: He CRAWLED yesterday!!! Yay!!! He only crawled about two or three paces, but they were definitely one-hand-in-front-of-the-other, one-knee-in-front-of-the-other crawl steps! Whoo-hoo!
Subsequent attempts to convince him to crawl, including luring him with a water bottle above, were met without success.
Give yourself a round of applause, Robert. You can be pleased with your accomplishment!