So, my son is now approaching 4 months old.
He has changed so much, I miss the newborn he once was.
I've been back at work since September, and I feel like I have missed so much.
He's such a happy boy, and always awakes with a massive smile.
Fatherhood... Is wonderful
Don't worry man, every time something changes and you lose one of the little things (like then being small enough to fall asleep on your chest), you get something new (crawling, walking, talking etc). I feel you though. I get home at 6, and I do bath and bedtime, and really weekends are where I get to interact.
I do get to hear her tell me about her day now though, which is really cool. I get to hear her opinions on things (often hilarious) now she's pretty chatty.
Basically, it stays awesome