It's amazing what a baby does in his first year. When we brought Connor home, he was 4 days old. He had no control over his limbs, he couldn't do anything except cry, poop, drink milk and sleep. Fast forward to today and this is a sample of what he did: Waved goodbye to the wait staff at Red Bean cafe, pointed excitedly to Thomas the Tank Engine in his book when I asked him to, drank from his sippy cup all by himself (thanks to our unorthodox training method!), finger-fed himself his animal biscuits and toddled over (ran? Well, he was quick!) amidst many squeals of delight to greet Daddy at the door when Dear Hubby arrived home from work.
I can't think of any equivalent in adult life that can compare to that amazing transformation.
I can't think of any equivalent in my life that has given me such joy either.