Oooh! That’s a simply adorable excuse! Color me jealous! 
You’re looking for the workable area sizes right? For cutting, it’s 10.947" x 19.45" on my machine…might vary slightly from that on other machines, but almost 11" x 19.5". So i usually just set up for about 10.75" x 19.25" to make sure it all fits.
Engraving changes based on the speeds being used. At fastest speeds, the limit is approximately 18.5" wide - I haven’t measured it exactly. You can slow the speed and lower the power to get larger horizontal numbers.
Have fun with that bebe’.