But I have to keep growing up so I can...

Xander:  "Mom, you can't carry us anymore."
Me:  "Why not?"
Xander:  "Cuz we are growing up and getting too big."
Me:  "That's right.  It is hard for me to carry you now.  Maybe you should stop growing and stay little."
Xander:  "But I have to keep growing up so I can be a Daaaaaad!"