C is for Change

So I've recently noticed how much my parenting styles, and I have changed from the time that my daughter was born until now.
Some of it I'm sure just comes with having a second child. For instance, someone asked me today how old my baby is. I replied that he will be 4 months old on the 20th. I have no idea how many weeks old he is. I could count it out if I took the time to look at a calendar, but just off the top of my head, I really don't know.
Also, my son is a wonderful sleeper. I am usually in bed no later than 11, and up no earlier than 5. Yes that is less sleep than I would choose, but he rarely wakes me up in between those times. Now, with my daughter I would have woken up several times in the night and felt the need to check on her to make sure she was still breathing, had she ever slept that long. Not now, I just enjoy the sleep, and even have a hard time getting myself out of bed when he does wake up.
I'm really laid back about development. He finally rolled over for the first time from back to stomach today. Which is great, but I haven't been sitting around waiting for him to do it, like I was with my daughter.
But in other ways I'm sure the differences are because of what I have learned and experienced in my years of being a mother. I am a lot more patient with my children now, than I ever was in my daughters first year. I am more positive, I do a better job of keeping my house clean. (Not that it isn't still messy, it just isn't as messy.)
So, are there ways that you have grown and become a better person in the time that has passed since you started your current stage of life what ever that may be? Do you think they are because of time and maturity? Or from learning the lessons from the trials put before you? Or maybe a little of both?