Where does the time go?

I can't believe how big Aiden is getting already. He is rolling over both ways and I swear he is crawling at night in his crib when we aren't looking. I came across this thing called The 3-Day Sleep Solution and it worked like a charm. We had to stop swaddling, get rid of the swing and the pacifier and teach him how to fall asleep on his own. He is sleeping through the night now and taking 3 half decent naps during the day all by himself in his big boy crib. He has also been drooling a ton and I think he might be starting to get some choppers on the bottom. He and Chloe are also becoming a lot more interested in one another and it's pretty cute. Since he doesn't really use his pacifier anymore he just plays with it when we give it to him. He takes it out of his mouth, stares at it and then tries to put it back all by himself (and watch TV at the same time). He will be 5 months old already next week and Brian and I just can't believe it.