At forty-one weeks:

• Gavin will now stand freely for two to five seconds at a time. Usually this occurs when he is so entranced by whatever object with which he is playing that he forgets to hold on to something.
• When going from leaning or standing freely to not leaning or standing freely (i.e. falling down), he now does so with more grace than previously, only face-planting a few times a day.
• Our little trucker is beginning to take to his Tonka. If I set him on a bearing towards something interesting, he will purposefully walk the truck forward. Once the goal is near, however, he gives up on bipedal locomotion and drops to the floor to crawl the home stretch.
• The Tilty Cup is no longer The Enemy. Gavin enjoys shaking, banging, throwing, and occasionally drinking from these new-fangled contraptions. Due to the violent nature of said interactions, we are only handing him Tilty Cups with water in them. Once the relationship has mellowed and the sparks no longer fly, we'll trust him (and the surrounding clothing, carpet and furnishings) with a Tilty full of formula.

I don't know what happened Dad, I was leaning on you, playing with my drawstrings, and now here I am standing by myself! I don't know how to stand! 

Mmmmm, wawa!