I think I'm in the minority on this, but given the chance, I would NOT choose to stop time with my kids. All the greeting cards and tee shirts lament the passage of time, but as much as I miss my babies, my kids are much more interesting to talk to and cook for and read to and go adventuring with.
A pause button, though? A pause button could come in handy for sure. And if I could pause time, I'd do so every other day between six months and a year. It is, hands down, my favorite baby age, full of smiles and wonder and giggles and thigh rolls and all the pudgy-handed love you can handle. Yeah... six months is pretty effing incredible.
I guess the camera is my version of the pause button.
Here's Jack, paused on perfect.