Where does the time go?

Max has his four month checkup tomorrow. I cannot believe he is already that old. He is doing really well and is such a cutie. Tim and I have predictions on his weight. Tim says 18.4 and I say 19.1. Yes, he is also a chunk. Last month he weighed almost 15 pounds, so he was close to tripling his birth weight at a little over three months. I hope they take him off of the premature formula. That stuff is so expensive.