Growing up fast
The transition from a sippy cup to a normal, adult cup is a tricky one. Kids always want to run before they can walk, and they’re desperate to be more grown-up than they are.
So, to make the transition easier on your carpet (or someone else’s carpet), you can use plastic wrap. Just put it over the top of the glass, and stick a straw through it. They’ll be getting an adult cup, and you’ll be getting peace of mind.