Why must they grow up?

Last night I cried my self to sleep. I had been thinking all day about how big my kids are getting. When I went to lay down last night I saw Avery laying in her crib. She looked so big! I couldn't help but start to cry. Where has the time gone? She will be 10 months old in a week. As I watch her everyday she is discovering new things. Right now her favorite thing to do is stand without holding onto anything. Slow down!!! I'm happy when she reaches a milestone, but secretly deep down I'm sad. I want her to stay my little chubby baby.
I have gotten this way with every baby I have had, but I know Avery is our last. I want her to stay little. I hope I have held her enough and played with her enough. I don't want to look back and think I should have done those things more. I guess for now I have to live in the moment. I need do the things with my kids that they probably wont want me to do with them as they get older. Like cuddling at night with my 7 year old, playing batman, and having tickle fights. Morgan helped me feel a bit better last night by saying, be happy, our kids are living, not dying. It's true. I have been blessed to have happy healthy kids. I just need to enjoy EVERY moment I have with them.