Standing on his own two feet
Although Luke has been walking for almost 2 months now, he has not mastered the art of standing up on his own.. As it turns out, it's not that easy to go from sitting to standing when you're belly is the size of a basketball. (Now that I think about it, I should have remembered that from pregnancy). Luke's method of standing is to crawl to the nearest chair/table/leg/dog and use it to pull himself up. Only then can he take off running.
Until one morning, however, when I looked over at Luke and realized that he was suddenly standing in the middle of the room. Um, how did he do that?? It may not seem that special to you, but even Luke knows that this is a pretty big deal.